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id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Delta (letter)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 92 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-92" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">92 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Delta_(letter)" title="Delta (letter) – Afrikaans" lang="af" hreflang="af" data-title="Delta (letter)" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/%CE%94" title="Δ – Alemannic" lang="gsw" hreflang="gsw" data-title="Δ" data-language-autonym="Alemannisch" data-language-local-name="Alemannic" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-ang mw-list-item"><a href="https://ang.wikipedia.org/wiki/%CE%94" title="Δ – Old English" lang="ang" hreflang="ang" data-title="Δ" data-language-autonym="Ænglisc" data-language-local-name="Old English" class="interlanguage-link-target"><span>Ænglisc</span></a></li><li class="interlanguage-link interwiki-ab mw-list-item"><a href="https://ab.wikipedia.org/wiki/%CE%94" title="Δ – Abkhazian" lang="ab" hreflang="ab" data-title="Δ" data-language-autonym="Аԥсшәа" data-language-local-name="Abkhazian" class="interlanguage-link-target"><span>Аԥсшәа</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AF%D9%84%D8%AA%D8%A7_(%D8%AD%D8%B1%D9%81)" title="دلتا (حرف) – Arabic" lang="ar" hreflang="ar" data-title="دلتا (حرف)" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-arc mw-list-item"><a href="https://arc.wikipedia.org/wiki/%CE%94" title="Δ – Aramaic" lang="arc" hreflang="arc" data-title="Δ" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="Aramaic" class="interlanguage-link-target"><span>ܐܪܡܝܐ</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Delta" title="Delta – Asturian" lang="ast" hreflang="ast" data-title="Delta" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%A1%E0%A7%87%E0%A6%B2%E0%A7%8D%E0%A6%9F%E0%A6%BE" title="ডেল্টা – Bangla" lang="bn" hreflang="bn" data-title="ডেল্টা" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/%CE%94" title="Δ – Minnan" lang="nan" hreflang="nan" data-title="Δ" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%94%D1%8D%D0%BB%D1%8C%D1%82%D0%B0_(%D0%BB%D1%96%D1%82%D0%B0%D1%80%D0%B0)" title="Дэльта (літара) – Belarusian" lang="be" hreflang="be" data-title="Дэльта (літара)" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%94%D1%8D%D0%BB%D1%8C%D1%82%D0%B0_(%D0%BB%D1%96%D1%82%D0%B0%D1%80%D0%B0)" title="Дэльта (літара) – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Дэльта (літара)" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%94%D0%B5%D0%BB%D1%82%D0%B0" title="Делта – Bulgarian" lang="bg" hreflang="bg" data-title="Делта" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Delta" title="Delta – Bavarian" lang="bar" hreflang="bar" data-title="Delta" data-language-autonym="Boarisch" data-language-local-name="Bavarian" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%91%E0%BD%BA%E0%BD%A3%E0%BC%8B%E0%BD%90%E0%BC%8D" title="དེལ་ཐ། – Tibetan" lang="bo" hreflang="bo" data-title="དེལ་ཐ།" data-language-autonym="བོད་ཡིག" data-language-local-name="Tibetan" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Delta_(lizherenn)" title="Delta (lizherenn) – Breton" lang="br" hreflang="br" data-title="Delta (lizherenn)" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Delta_(lletra)" title="Delta (lletra) – Catalan" lang="ca" hreflang="ca" data-title="Delta (lletra)" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Delta_(p%C3%ADsmeno)" title="Delta (písmeno) – Czech" lang="cs" hreflang="cs" data-title="Delta (písmeno)" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Delta_(llythyren)" title="Delta (llythyren) – Welsh" lang="cy" hreflang="cy" data-title="Delta (llythyren)" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Delta_(bogstav)" title="Delta (bogstav) – Danish" lang="da" hreflang="da" data-title="Delta (bogstav)" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-se mw-list-item"><a href="https://se.wikipedia.org/wiki/%CE%94" title="Δ – Northern Sami" lang="se" hreflang="se" data-title="Δ" data-language-autonym="Davvisámegiella" data-language-local-name="Northern Sami" class="interlanguage-link-target"><span>Davvisámegiella</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Delta" title="Delta – German" lang="de" hreflang="de" data-title="Delta" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Delta_(t%C3%A4ht)" title="Delta (täht) – Estonian" lang="et" hreflang="et" data-title="Delta (täht)" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%94%CE%AD%CE%BB%CF%84%CE%B1" title="Δέλτα – Greek" lang="el" hreflang="el" data-title="Δέλτα" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/%CE%94" title="Δ – Spanish" lang="es" hreflang="es" data-title="Δ" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Delto_(litero)" title="Delto (litero) – Esperanto" lang="eo" hreflang="eo" data-title="Delto (litero)" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Delta_(letra)" title="Delta (letra) – Extremaduran" lang="ext" hreflang="ext" data-title="Delta (letra)" data-language-autonym="Estremeñu" data-language-local-name="Extremaduran" class="interlanguage-link-target"><span>Estremeñu</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Delta_(hizkia)" title="Delta (hizkia) – Basque" lang="eu" hreflang="eu" data-title="Delta (hizkia)" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AF%D9%84%D8%AA%D8%A7_(%D8%AD%D8%B1%D9%81)" title="دلتا (حرف) – Persian" lang="fa" hreflang="fa" data-title="دلتا (حرف)" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fo mw-list-item"><a href="https://fo.wikipedia.org/wiki/Delta" title="Delta – Faroese" lang="fo" hreflang="fo" data-title="Delta" data-language-autonym="Føroyskt" data-language-local-name="Faroese" class="interlanguage-link-target"><span>Føroyskt</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Delta" title="Delta – French" lang="fr" hreflang="fr" data-title="Delta" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Deilte" title="Deilte – Irish" lang="ga" hreflang="ga" data-title="Deilte" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gd mw-list-item"><a href="https://gd.wikipedia.org/wiki/Delta" title="Delta – Scottish Gaelic" lang="gd" hreflang="gd" data-title="Delta" data-language-autonym="Gàidhlig" data-language-local-name="Scottish Gaelic" class="interlanguage-link-target"><span>Gàidhlig</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Delta_(letra)" title="Delta (letra) – Galician" lang="gl" hreflang="gl" data-title="Delta (letra)" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/%CE%94" title="Δ – Hakka Chinese" lang="hak" hreflang="hak" data-title="Δ" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="Hakka Chinese" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%CE%94" title="Δ – Korean" lang="ko" hreflang="ko" data-title="Δ" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B4%D5%A5%D5%AC%D5%BF%D5%A1_(%D5%BF%D5%A1%D5%BC)" title="Դելտա (տառ) – Armenian" lang="hy" hreflang="hy" data-title="Դելտա (տառ)" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A1%E0%A5%87%E0%A4%B2%E0%A5%8D%E0%A4%9F%E0%A4%BE_(%E0%A4%85%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A4%B0)" title="डेल्टा (अक्षर) – Hindi" lang="hi" hreflang="hi" data-title="डेल्टा (अक्षर)" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Delta" title="Delta – Croatian" lang="hr" hreflang="hr" data-title="Delta" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Delta_(huruf)" title="Delta (huruf) – Indonesian" lang="id" hreflang="id" data-title="Delta (huruf)" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Delta" title="Delta – Icelandic" lang="is" hreflang="is" data-title="Delta" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Delta_(lettera)" title="Delta (lettera) – Italian" lang="it" hreflang="it" data-title="Delta (lettera)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%93%D7%9C%D7%AA%D7%90_(%D7%90%D7%95%D7%AA)" title="דלתא (אות) – Hebrew" lang="he" hreflang="he" data-title="דלתא (אות)" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%93%E1%83%94%E1%83%9A%E1%83%A2%E1%83%90_(%E1%83%90%E1%83%A1%E1%83%9D)" title="დელტა (ასო) – Georgian" lang="ka" hreflang="ka" data-title="დელტა (ასო)" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Delta_(herufi)" title="Delta (herufi) – Swahili" lang="sw" hreflang="sw" data-title="Delta (herufi)" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-kv mw-list-item"><a href="https://kv.wikipedia.org/wiki/%D0%94%D1%8D%D0%BB%D1%8C%D1%82%D0%B0" title="Дэльта – Komi" lang="kv" hreflang="kv" data-title="Дэльта" data-language-autonym="Коми" data-language-local-name="Komi" class="interlanguage-link-target"><span>Коми</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/%CE%94" title="Δ – Haitian Creole" lang="ht" hreflang="ht" data-title="Δ" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitian Creole" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Delta_(herf)" title="Delta (herf) – Kurdish" lang="ku" hreflang="ku" data-title="Delta (herf)" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Delta" title="Delta – Latin" lang="la" hreflang="la" data-title="Delta" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Delta_(burts)" title="Delta (burts) – Latvian" lang="lv" hreflang="lv" data-title="Delta (burts)" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Delta" title="Delta – Luxembourgish" lang="lb" hreflang="lb" data-title="Delta" data-language-autonym="Lëtzebuergesch" data-language-local-name="Luxembourgish" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lez mw-list-item"><a href="https://lez.wikipedia.org/wiki/%D0%94%D0%B5%D0%BB%D1%8C%D1%82%D0%B0_(%D0%B3%D1%8C%D0%B0%D1%80%D1%84)" title="Дельта (гьарф) – Lezghian" lang="lez" hreflang="lez" data-title="Дельта (гьарф)" data-language-autonym="Лезги" data-language-local-name="Lezghian" class="interlanguage-link-target"><span>Лезги</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Delta_(raid%C4%97)" title="Delta (raidė) – Lithuanian" lang="lt" hreflang="lt" data-title="Delta (raidė)" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Delta_(bet%C5%B1)" title="Delta (betű) – Hungarian" lang="hu" hreflang="hu" data-title="Delta (betű)" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%A1%E0%B5%86%E0%B5%BD%E0%B4%B1%E0%B5%8D%E0%B4%B1_(%E0%B4%85%E0%B4%95%E0%B5%8D%E0%B4%B7%E0%B4%B0%E0%B4%82)" title="ഡെൽറ്റ (അക്ഷരം) – Malayalam" lang="ml" hreflang="ml" data-title="ഡെൽറ്റ (അക്ഷരം)" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%A1%E0%A5%87%E0%A4%B2%E0%A5%8D%E0%A4%9F%E0%A4%BE_(%E0%A4%85%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A4%B0)" title="डेल्टा (अक्षर) – Marathi" lang="mr" hreflang="mr" data-title="डेल्टा (अक्षर)" data-language-autonym="मराठी" data-language-local-name="Marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Delta_(huruf)" title="Delta (huruf) – Malay" lang="ms" hreflang="ms" data-title="Delta (huruf)" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/Delta" title="Delta – Mindong" lang="cdo" hreflang="cdo" data-title="Delta" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Delta_(letter)" title="Delta (letter) – Dutch" lang="nl" hreflang="nl" data-title="Delta (letter)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%CE%94" title="Δ – Japanese" lang="ja" hreflang="ja" data-title="Δ" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Delta_(bokstav)" title="Delta (bokstav) – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Delta (bokstav)" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Delta" title="Delta – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Delta" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/D%C3%A8lta" title="Dèlta – Occitan" lang="oc" hreflang="oc" data-title="Dèlta" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%A1%E0%A9%88%E0%A8%B2%E0%A8%9F%E0%A8%BE_(%E0%A8%85%E0%A9%B1%E0%A8%96%E0%A8%B0)" title="ਡੈਲਟਾ (ਅੱਖਰ) – Punjabi" lang="pa" hreflang="pa" data-title="ਡੈਲਟਾ (ਅੱਖਰ)" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%DA%89%DB%90%D9%84%D9%BC%D8%A7" title="ډېلټا – Pashto" lang="ps" hreflang="ps" data-title="ډېلټا" data-language-autonym="پښتو" data-language-local-name="Pashto" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Delta" title="Delta – Low German" lang="nds" hreflang="nds" data-title="Delta" data-language-autonym="Plattdüütsch" data-language-local-name="Low German" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Delta_(litera)" title="Delta (litera) – Polish" lang="pl" hreflang="pl" data-title="Delta (litera)" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/%CE%94" title="Δ – Portuguese" lang="pt" hreflang="pt" data-title="Δ" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Delta_(liter%C4%83)" title="Delta (literă) – Romanian" lang="ro" hreflang="ro" data-title="Delta (literă)" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%94%D0%B5%D0%BB%D1%8C%D1%82%D0%B0_(%D0%B1%D1%83%D0%BA%D0%B2%D0%B0)" title="Дельта (буква) – Russian" lang="ru" hreflang="ru" data-title="Дельта (буква)" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Delta" title="Delta – Simple English" lang="en-simple" hreflang="en-simple" data-title="Delta" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Delta_(gr%C3%A9cke_p%C3%ADsmeno)" title="Delta (grécke písmeno) – Slovak" lang="sk" hreflang="sk" data-title="Delta (grécke písmeno)" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Delta" title="Delta – Slovenian" lang="sl" hreflang="sl" data-title="Delta" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%AF%DB%8E%D9%84%D8%AA%D8%A7_(%D9%BE%DB%8C%D8%AA)" title="دێلتا (پیت) – Central Kurdish" lang="ckb" hreflang="ckb" data-title="دێلتا (پیت)" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Delta_(slovo)" title="Delta (slovo) – Serbian" lang="sr" hreflang="sr" data-title="Delta (slovo)" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Delta_(slovo)" title="Delta (slovo) – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Delta (slovo)" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Delta" title="Delta – Finnish" lang="fi" hreflang="fi" data-title="Delta" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Delta" title="Delta – Swedish" lang="sv" hreflang="sv" data-title="Delta" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%A4%E0%AF%86%E0%AE%B2%E0%AF%81%E0%AE%A4%E0%AF%8D%E0%AE%A4%E0%AE%BE" title="தெலுத்தா – Tamil" lang="ta" hreflang="ta" data-title="தெலுத்தா" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%94%E0%B8%A5%E0%B8%95%E0%B8%B2" title="เดลตา – Thai" lang="th" hreflang="th" data-title="เดลตา" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Delta_(harf)" title="Delta (harf) – Turkish" lang="tr" hreflang="tr" data-title="Delta (harf)" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-kcg mw-list-item"><a href="https://kcg.wikipedia.org/wiki/Da%CC%B1li%CC%B1ta_(zwunzwuo-a%CC%B1lyem)" title="Da̱li̱ta (zwunzwuo-a̱lyem) – Tyap" lang="kcg" hreflang="kcg" data-title="Da̱li̱ta (zwunzwuo-a̱lyem)" data-language-autonym="Tyap" data-language-local-name="Tyap" class="interlanguage-link-target"><span>Tyap</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%94%D0%B5%D0%BB%D1%8C%D1%82%D0%B0_(%D0%BB%D1%96%D1%82%D0%B5%D1%80%D0%B0)" title="Дельта (літера) – Ukrainian" lang="uk" hreflang="uk" data-title="Дельта (літера)" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%DA%88%DB%8C%D9%84%D9%B9%D8%A7" title="ڈیلٹا – Urdu" lang="ur" hreflang="ur" data-title="ڈیلٹا" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/Del%27ta" title="Del'ta – Veps" lang="vep" hreflang="vep" data-title="Del'ta" data-language-autonym="Vepsän kel’" data-language-local-name="Veps" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Delta" title="Delta – Vietnamese" lang="vi" hreflang="vi" data-title="Delta" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Delta_(agi)" title="Delta (agi) – Waray" lang="war" hreflang="war" data-title="Delta (agi)" data-language-autonym="Winaray" data-language-local-name="Waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%CE%94" title="Δ – Wu" lang="wuu" hreflang="wuu" data-title="Δ" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%93%D7%A2%D7%9C%D7%98%D7%A2_(%D7%90%D7%95%D7%AA)" title="דעלטע (אות) – Yiddish" lang="yi" hreflang="yi" data-title="דעלטע (אות)" data-language-autonym="ייִדיש" data-language-local-name="Yiddish" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%CE%94" title="Δ – Cantonese" lang="yue" hreflang="yue" data-title="Δ" data-language-autonym="粵語" data-language-local-name="Cantonese" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/%CE%94" title="Δ – Zazaki" lang="diq" hreflang="diq" data-title="Δ" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%CE%94" title="Δ – Chinese" lang="zh" hreflang="zh" data-title="Δ" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-kge mw-list-item"><a href="https://kge.wikipedia.org/wiki/%CE%94_(Delta)" title="Δ (Delta) – Komering" lang="kge" hreflang="kge" data-title="Δ (Delta)" data-language-autonym="Kumoring" data-language-local-name="Komering" class="interlanguage-link-target"><span>Kumoring</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit 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class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Fourth letter in the Greek alphabet</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"Δ" redirects here. For other uses, see <a href="/wiki/%E2%88%86_(disambiguation)" class="mw-redirect mw-disambig" title="∆ (disambiguation)">∆ (disambiguation)</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Delta_(letter)" title="Special:EditPage/Delta (letter)">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Delta%22+letter">"Delta" letter</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Delta%22+letter+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Delta%22+letter&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Delta%22+letter+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Delta%22+letter">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Delta%22+letter&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span 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href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><table class="sidebar nomobile nowraplinks greek-alphabet-sidebar" style="width:20em"><tbody><tr><td class="sidebar-top-image"><span class="skin-invert" typeof="mw:File"><a href="/wiki/File:Delta_uc_lc.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Delta_uc_lc.svg/100px-Delta_uc_lc.svg.png" decoding="async" width="100" height="67" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Delta_uc_lc.svg/150px-Delta_uc_lc.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Delta_uc_lc.svg/200px-Delta_uc_lc.svg.png 2x" data-file-width="3000" data-file-height="2000" /></a></span></td></tr><tr><th class="sidebar-title"><a href="/wiki/Greek_alphabet" title="Greek alphabet">Greek alphabet</a></th></tr><tr><td class="sidebar-content hlist"> <table style="width:100%;border-collapse:collapse;border-spacing:0px 0px;border:none;margin-left:0.7em;text-align:left;"><tbody><tr style="vertical-align:top"><td> Αα</td><td style="padding-right:1.0em;"> <a href="/wiki/Alpha" title="Alpha">Alpha</a></td><td> Νν</td><td style="padding-right:0.6em;"> <a href="/wiki/Nu_(letter)" title="Nu (letter)">Nu</a></td></tr><tr style="vertical-align:top"><td> Ββ</td><td style="padding-right:1.0em;"> <a href="/wiki/Beta" title="Beta">Beta</a></td><td> Ξξ</td><td style="padding-right:0.6em;"> <a href="/wiki/Xi_(letter)" title="Xi (letter)">Xi</a></td></tr><tr style="vertical-align:top"><td> Γγ</td><td style="padding-right:1.0em;"> <a href="/wiki/Gamma" title="Gamma">Gamma</a></td><td> Οο</td><td style="padding-right:0.6em;"> <a href="/wiki/Omicron" title="Omicron">Omicron</a></td></tr><tr style="vertical-align:top"><td> Δδ</td><td style="padding-right:1.0em;"> <a class="mw-selflink selflink">Delta</a></td><td> Ππ</td><td style="padding-right:0.6em;"> <a href="/wiki/Pi_(letter)" title="Pi (letter)">Pi</a></td></tr><tr style="vertical-align:top"><td> Εε</td><td style="padding-right:1.0em;"> <a href="/wiki/Epsilon" title="Epsilon">Epsilon</a></td><td> Ρρ</td><td style="padding-right:0.6em;"> <a href="/wiki/Rho" title="Rho">Rho</a></td></tr><tr style="vertical-align:top"><td> Ζζ</td><td style="padding-right:1.0em;"> <a href="/wiki/Zeta" title="Zeta">Zeta</a></td><td> Σσς</td><td style="padding-right:0.6em;"> <a href="/wiki/Sigma" title="Sigma">Sigma</a></td></tr><tr style="vertical-align:top"><td> Ηη</td><td style="padding-right:1.0em;"> <a href="/wiki/Eta" title="Eta">Eta</a></td><td> Ττ</td><td style="padding-right:0.6em;"> <a href="/wiki/Tau" title="Tau">Tau</a></td></tr><tr style="vertical-align:top"><td> Θθ</td><td style="padding-right:1.0em;"> <a href="/wiki/Theta" title="Theta">Theta</a></td><td> Υυ</td><td style="padding-right:0.6em;"> <a href="/wiki/Upsilon" title="Upsilon">Upsilon</a></td></tr><tr style="vertical-align:top"><td> Ιι</td><td style="padding-right:1.0em;"> <a href="/wiki/Iota" title="Iota">Iota</a></td><td> Φφ</td><td style="padding-right:0.6em;"> <a href="/wiki/Phi" title="Phi">Phi</a></td></tr><tr style="vertical-align:top"><td> Κκ</td><td style="padding-right:1.0em;"> <a href="/wiki/Kappa" title="Kappa">Kappa</a></td><td> Χχ</td><td style="padding-right:0.6em;"> <a href="/wiki/Chi_(letter)" title="Chi (letter)">Chi</a></td></tr><tr style="vertical-align:top"><td> Λλ</td><td style="padding-right:1.0em;"> <a href="/wiki/Lambda" title="Lambda">Lambda</a></td><td> Ψψ</td><td style="padding-right:0.6em;"> <a href="/wiki/Psi_(Greek)" title="Psi (Greek)">Psi</a></td></tr><tr style="vertical-align:top"><td> Μμ</td><td style="padding-right:1.0em;"> <a href="/wiki/Mu_(letter)" title="Mu (letter)">Mu</a></td><td> Ωω</td><td style="padding-right:0.6em;"> <a href="/wiki/Omega" title="Omega">Omega</a></td></tr></tbody></table></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/History_of_the_Greek_alphabet" title="History of the Greek alphabet">History</a></th></tr><tr><td class="sidebar-content hlist"> <div style="display:inline-block; padding:0.2em 0.4em; line-height:1.2em; line-height:1.1em;padding-bottom:0.45em;"> <a href="/wiki/Archaic_Greek_alphabets" title="Archaic Greek alphabets"><b>Archaic local variants</b></a></div> <table style="width:100%;border-collapse:collapse;border-spacing:0px 0px;border:none;margin-left:0.7em;text-align:left;"><tbody><tr style="vertical-align:top"><td> Ϝ</td><td style="padding-right:1.0em;"> <a href="/wiki/Digamma" title="Digamma">Digamma</a></td><td> Ͱ</td><td style="padding-right:0.6em;"> <a href="/wiki/Heta" title="Heta">Heta</a></td></tr><tr style="vertical-align:top"><td> Ϻ</td><td style="padding-right:1.0em;"> <a href="/wiki/San_(letter)" title="San (letter)">San</a></td><td> Ϙ</td><td style="padding-right:0.6em;"> <a href="/wiki/Koppa_(letter)" title="Koppa (letter)">Koppa</a></td></tr><tr style="vertical-align:top"><td> Ͷ</td><td style="padding-right:1.0em;"> <div class="hlist inline"><ul><li><a href="/wiki/Tsan" class="mw-redirect" title="Tsan">Tsan</a></li><li><a href="/wiki/Digamma#Pamphylian_digamma" title="Digamma">Digamma</a></li></ul></div></td><td> Ͳ</td><td style="padding-right:0.6em;"> <a href="/wiki/Sampi" title="Sampi">Sampi</a></td></tr></tbody></table></td> </tr><tr><th class="sidebar-heading"> Diacritics and other symbols</th></tr><tr><td class="sidebar-content hlist"> <div style="display:inline-block; padding:0.2em 0.4em; line-height:1.2em; padding-top:0.3em;line-height:1.1em;padding-bottom:0;"><a href="/wiki/Greek_diacritics" title="Greek diacritics">Diacritics</a></div> <div class="hlist"><ul><li><a href="/wiki/Acute_accent" title="Acute accent">ά</a></li><li><a href="/wiki/Grave_accent" title="Grave accent">ὰ</a></li><li><a href="/wiki/Circumflex" title="Circumflex">ᾶ</a></li><li><a href="/wiki/Smooth_breathing" title="Smooth breathing">ἀ</a></li><li><a href="/wiki/Rough_breathing" title="Rough breathing">ἁ</a></li><li><a href="/wiki/Macron_(diacritic)" title="Macron (diacritic)">ᾱ</a></li><li><a href="/wiki/Breve" title="Breve">ᾰ</a></li><li><a href="/wiki/Diaeresis_(diacritic)" title="Diaeresis (diacritic)">ϊ</a></li><li><a href="/wiki/Iota_subscript" title="Iota subscript">ᾳ</a></li><li><a href="/wiki/Caron" title="Caron">σ̌</a></li></ul></div> <div style="display:inline-block; padding:0.2em 0.4em; line-height:1.2em; padding-top:0.3em;line-height:1.1em;padding-bottom:0;"><a href="/wiki/Greek_ligatures" title="Greek ligatures">Ligatures</a></div> <div class="hlist"><ul><li style="font-size:110%;"><a href="/wiki/Kai_(conjunction)" title="Kai (conjunction)">ϗ</a></li><li style="font-size:110%;"><a href="/wiki/Stigma_(ligature)" title="Stigma (ligature)">ϛ</a></li></ul></div> <div style="display:inline-block; padding:0.2em 0.4em; line-height:1.2em; padding-top:0.3em;line-height:1.1em;padding-bottom:0;"> <a href="/wiki/Greek_numerals" title="Greek numerals">Numerals</a> (<a href="/wiki/Attic_numerals" title="Attic numerals">Attic</a>)</div> <div class="hlist"><ul><li style="font-size:110%;"><a href="/wiki/Digamma" title="Digamma">ϛ <span style="font-size:85%;">(6)</span></a></li><li style="font-size:110%;"><a href="/wiki/Koppa_(letter)" title="Koppa (letter)">ϟ <span style="font-size:85%;">(90)</span></a></li><li style="font-size:110%;"><a href="/wiki/Sampi" title="Sampi">ϡ <span style="font-size:85%;">(900)</span></a></li></ul></div></td> </tr><tr><th class="sidebar-heading"> Related topics</th></tr><tr><td class="sidebar-content hlist"> <ul><li><a href="/wiki/Greek_letters_used_in_mathematics,_science,_and_engineering" title="Greek letters used in mathematics, science, and engineering">Use as scientific symbols</a></li> <li><a href="/wiki/Greek_orthography" title="Greek orthography">Orthography</a></li> <li><a href="/wiki/Romanization_of_Greek" title="Romanization of Greek">Romanization</a></li> <li><a href="/wiki/Cyrillization_of_Greek" title="Cyrillization of Greek">Cyrillization</a></li></ul></td> </tr><tr><td class="sidebar-below plainlist"> <div class="hlist"> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Greek_letters" title="Category:Greek letters">Category</a></li></ul> </div></td></tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 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rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Not to be confused with ẟ, the <a href="/wiki/Latin_delta" title="Latin delta">Latin delta</a>.</div> <p><b>Delta</b> (<span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="/ˈ/: primary stress follows">ˈ</span><span title="'d' in 'dye'">d</span><span title="/ɛ/: 'e' in 'dress'">ɛ</span><span title="'l' in 'lie'">l</span><span title="'t' in 'tie'">t</span><span title="/ə/: 'a' in 'about'">ə</span></span>/</a></span></span>;<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> uppercase <b>Δ</b>, lowercase <b>δ</b>; <a href="/wiki/Greek_language" title="Greek language">Greek</a>: <span lang="el">δέλτα</span>, <i>délta</i>, <span class="IPA nowrap" lang="el-Latn-fonipa"><a href="/wiki/Help:IPA/Greek" title="Help:IPA/Greek">[ˈðelta]</a></span>)<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> is the fourth letter of the <a href="/wiki/Greek_alphabet" title="Greek alphabet">Greek alphabet</a>. In the system of <a href="/wiki/Greek_numerals" title="Greek numerals">Greek numerals</a> it has a value of 4. It was derived from the <a href="/wiki/Phoenician_alphabet" title="Phoenician alphabet">Phoenician letter</a> <a href="/wiki/Dalet_(letter)" class="mw-redirect" title="Dalet (letter)">dalet</a> 𐤃.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Letters that come from delta include <a href="/wiki/Latin_alphabet" title="Latin alphabet">Latin</a> <a href="/wiki/D" title="D">D</a> and <a href="/wiki/Cyrillic_script" title="Cyrillic script">Cyrillic</a> <a href="/wiki/De_(Cyrillic)" title="De (Cyrillic)">Д</a>. </p><p>A <a href="/wiki/River_delta" title="River delta">river delta</a> (originally, the <a href="/wiki/Nile_Delta" title="Nile Delta">delta</a> of the <a href="/wiki/Nile_River" class="mw-redirect" title="Nile River">Nile River</a>) is so named because its shape approximates the triangular uppercase letter delta. Contrary to a popular legend, this use of the word <i>delta</i> was not coined by <a href="/wiki/Herodotus" title="Herodotus">Herodotus</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Pronunciation">Pronunciation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Delta_(letter)&action=edit&section=1" title="Edit section: Pronunciation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In <a href="/wiki/Ancient_Greek" title="Ancient Greek">Ancient Greek</a>, delta represented a <a href="/wiki/Voiced_dental_plosive" class="mw-redirect" title="Voiced dental plosive">voiced dental plosive</a> <style data-mw-deduplicate="TemplateStyles:r1177148991">.mw-parser-output .IPA-label-small{font-size:85%}.mw-parser-output .references .IPA-label-small,.mw-parser-output .infobox .IPA-label-small,.mw-parser-output .navbox .IPA-label-small{font-size:100%}</style><span class="IPA-label IPA-label-small">IPA:</span> <span class="IPA nowrap" lang="el-Latn-fonipa"><a href="/wiki/Help:IPA/Greek" title="Help:IPA/Greek">[d]</a></span>. In <a href="/wiki/Modern_Greek" title="Modern Greek">Modern Greek</a>, it represents a <a href="/wiki/Voiced_dental_fricative" title="Voiced dental fricative">voiced dental fricative</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1177148991"><span class="IPA-label IPA-label-small">IPA:</span> <span class="IPA nowrap" lang="el-Latn-fonipa"><a href="/wiki/Help:IPA/Greek" title="Help:IPA/Greek">[ð]</a></span>, like the "th" in "that" or "this" (while <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1177148991"><span class="IPA-label IPA-label-small">IPA:</span> <span class="IPA nowrap" lang="el-Latn-fonipa"><a href="/wiki/Help:IPA/Greek" title="Help:IPA/Greek">[d]</a></span> in foreign words is instead commonly transcribed as ντ). Delta is <a href="/wiki/Romanization_of_Greek" title="Romanization of Greek">romanized</a> as <i>d</i> or <i>dh</i>. </p> <div class="mw-heading mw-heading2"><h2 id="Uppercase">Uppercase</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Delta_(letter)&action=edit&section=2" title="Edit section: Uppercase"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The uppercase letter Δ is used to denote: </p> <ul><li>Change of any changeable quantity, in mathematics and the sciences (in particular, the <a href="/wiki/Difference_operator" class="mw-redirect" title="Difference operator">difference operator</a><sup id="cite_ref-Richardson1954_5-0" class="reference"><a href="#cite_note-Richardson1954-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Comenetz2002_6-0" class="reference"><a href="#cite_note-Comenetz2002-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>); for example, in <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {y_{2}-y_{1}}{x_{2}-x_{1}}}={\frac {\Delta y}{\Delta x}},}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>y</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mo>−</mo> <msub> <mi>y</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> </mrow> <mrow> <msub> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mo>−</mo> <msub> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">Δ</mi> <mi>y</mi> </mrow> <mrow> <mi mathvariant="normal">Δ</mi> <mi>x</mi> </mrow> </mfrac> </mrow> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {y_{2}-y_{1}}{x_{2}-x_{1}}}={\frac {\Delta y}{\Delta x}},}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/515ac019ee8fc51a74404e14c3e09714d32ee9d4" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.171ex; width:16.291ex; height:5.843ex;" alt="{\displaystyle {\frac {y_{2}-y_{1}}{x_{2}-x_{1}}}={\frac {\Delta y}{\Delta x}},}"></span> the average change of <i>y</i> per unit <i>x</i> (i.e. the change of <i>y</i> over the change of <i>x</i>). Delta is the initial letter of the Greek word <span title="Greek-language text"><span lang="el">διαφορά</span></span> <i>diaphorá</i>, "difference". (The small <a href="/wiki/Latin" title="Latin">Latin</a> letter <b>d</b> is used in much the same way for the notation of <a href="/wiki/Derivative" title="Derivative">derivatives</a> and <a href="/wiki/Differential_(mathematics)" title="Differential (mathematics)">differentials</a>, which also describe change by <a href="/wiki/Infinitesimal" title="Infinitesimal">infinitesimal</a> amounts.)</li> <li>The <a href="/wiki/Laplace_operator" title="Laplace operator">Laplace operator</a>: <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \Delta f=\sum _{i=1}^{n}{\frac {\partial ^{2}f}{\partial x_{i}^{2}}}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Δ</mi> <mi>f</mi> <mo>=</mo> <munderover> <mo>∑</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>n</mi> </mrow> </munderover> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mi mathvariant="normal">∂</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>f</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <msubsup> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Delta f=\sum _{i=1}^{n}{\frac {\partial ^{2}f}{\partial x_{i}^{2}}}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/357e19220aff5779e5b7e8aa2bf79ea3b6fc7a26" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.005ex; width:15.24ex; height:6.843ex;" alt="{\displaystyle \Delta f=\sum _{i=1}^{n}{\frac {\partial ^{2}f}{\partial x_{i}^{2}}}.}"></span></dd></dl></li> <li>The <a href="/wiki/Discriminant" title="Discriminant">discriminant</a> of a <a href="/wiki/Polynomial" title="Polynomial">polynomial</a> equation, especially the <a href="/wiki/Quadratic_equation" title="Quadratic equation">quadratic equation</a>:<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \Delta =b^{2}-4ac.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Δ</mi> <mo>=</mo> <msup> <mi>b</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>−</mo> <mn>4</mn> <mi>a</mi> <mi>c</mi> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Delta =b^{2}-4ac.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1edcf6fef18bec26bcc7988626af5fa4cea3b0f8" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:13.972ex; height:2.843ex;" alt="{\displaystyle \Delta =b^{2}-4ac.}"></span></dd></dl></li> <li>The <a href="/wiki/Area_of_a_triangle" title="Area of a triangle">area of a triangle</a> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \Delta ={\tfrac {1}{2}}ab\sin {C}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Δ</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mstyle> </mrow> <mi>a</mi> <mi>b</mi> <mi>sin</mi> <mo>⁡</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>C</mi> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Delta ={\tfrac {1}{2}}ab\sin {C}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8adafa729841e365f35ba733da051bafaef2860b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.171ex; width:14.963ex; height:3.509ex;" alt="{\displaystyle \Delta ={\tfrac {1}{2}}ab\sin {C}.}"></span></dd></dl></li> <li>The <a href="/wiki/Symmetric_difference" title="Symmetric difference">symmetric difference</a> of two sets.</li> <li>A <a href="/wiki/Derivative" title="Derivative">macroscopic change</a> in the value of a variable in mathematics or science.</li> <li><a href="/wiki/Uncertainty" title="Uncertainty">Uncertainty</a> in a physical variable as seen in the <a href="/wiki/Uncertainty_principle" title="Uncertainty principle">uncertainty principle</a>.</li> <li>An interval of possible values for a given quantity.</li> <li>Any of the <a href="/wiki/Delta_baryon" title="Delta baryon">delta particles</a> in particle physics.</li> <li>The determinant of the matrix of coefficients of a set of linear equations (see <a href="/wiki/Cramer%27s_rule" title="Cramer's rule">Cramer's rule</a>).</li> <li>That an associated <a href="/wiki/Locant" title="Locant">locant</a> number represents the location of a <a href="/wiki/Covalent_bond" title="Covalent bond">covalent bond</a> in an <a href="/wiki/Organic_compound" title="Organic compound">organic compound</a>, the position of which is variant between <a href="/wiki/Isomer" title="Isomer">isomeric</a> forms.</li> <li>A <a href="/wiki/Simplex" title="Simplex">simplex</a>, <a href="/wiki/Simplicial_complex" title="Simplicial complex">simplicial complex</a>, or <a href="/wiki/Convex_hull" title="Convex hull">convex hull</a>.</li> <li>In chemistry, the addition of heat in a reaction.</li> <li>In <a href="/wiki/Legal_shorthand" class="mw-redirect" title="Legal shorthand">legal shorthand</a>, it represents a <a href="/wiki/Defendant" title="Defendant">defendant</a>.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></li> <li>In the financial markets, one of the <a href="/wiki/Greeks_(finance)" title="Greeks (finance)">Greeks</a>, describes the rate of change of an option price for a given change in the underlying benchmark.</li> <li>A <a href="/wiki/Major_seventh_chord" title="Major seventh chord">major seventh chord</a> in jazz music notation.</li> <li>In <a href="/wiki/Genetics" title="Genetics">genetics</a>, it can stand for a <a href="/wiki/Deletion_(genetics)" title="Deletion (genetics)">gene deletion</a> (e.g. the <a href="/wiki/CCR5-%CE%9432" class="mw-redirect" title="CCR5-Δ32">CCR5-Δ32</a>, a 32 nucleotide/bp deletion within CCR5).</li> <li>The <a href="/wiki/American_Dental_Association" title="American Dental Association">American Dental Association</a> cites it (together with <a href="/wiki/Omicron" title="Omicron">omicron</a> for "odont") as the symbol of dentistry.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup></li> <li>The anonymous signature of <a href="/wiki/James_David_Forbes" title="James David Forbes">James David Forbes</a>.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup></li> <li>Determinacy (having a definite truth-value) in <a href="/wiki/Philosophical_logic" title="Philosophical logic">philosophical logic</a>.</li> <li>In mathematics, the symbol ≜ (delta over equals) is occasionally used to define a new variable or function.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Lowercase">Lowercase</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Delta_(letter)&action=edit&section=3" title="Edit section: Lowercase"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:NAMA_Alphabet_grec.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/NAMA_Alphabet_grec.jpg/220px-NAMA_Alphabet_grec.jpg" decoding="async" width="220" height="192" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/NAMA_Alphabet_grec.jpg/330px-NAMA_Alphabet_grec.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/df/NAMA_Alphabet_grec.jpg/440px-NAMA_Alphabet_grec.jpg 2x" data-file-width="1600" data-file-height="1398" /></a><figcaption>The <a href="/wiki/Alphabet" title="Alphabet">alphabet</a> on a <a href="/wiki/Black_figure" class="mw-redirect" title="Black figure">black figure</a> vessel, with a D-shaped delta.</figcaption></figure> <p>The lowercase letter δ (or 𝛿) can be used to denote: </p> <ul><li>A change in the value of a variable in <a href="/wiki/Calculus" title="Calculus">calculus</a></li> <li>A <a href="/wiki/Functional_derivative" title="Functional derivative">functional derivative</a> in <a href="/wiki/Functional_calculus" title="Functional calculus">functional calculus</a></li> <li>The <a href="/wiki/(%CE%B5,_%CE%B4)-definition_of_limit" class="mw-redirect" title="(ε, δ)-definition of limit">(ε, δ)-definition of limits</a>, in mathematics and more specifically in <a href="/wiki/Calculus" title="Calculus">calculus</a></li> <li>The <a href="/wiki/Kronecker_delta" title="Kronecker delta">Kronecker delta</a> in mathematics</li> <li>The degree of a <a href="/wiki/Vertex_(graph_theory)" title="Vertex (graph theory)">vertex (graph theory)</a></li> <li>The <a href="/wiki/Dirac_delta_function" title="Dirac delta function">Dirac delta function</a> in mathematics</li> <li>The transition function in <a href="/wiki/Finite-state_machine" title="Finite-state machine">automata</a></li> <li><a href="/wiki/Deflection_(engineering)" title="Deflection (engineering)">Deflection</a> in engineering mechanics</li> <li>The <a href="/wiki/Compound_interest" title="Compound interest">force of interest</a> in actuarial science</li> <li>The <a href="/wiki/Chemical_shift" title="Chemical shift">chemical shift</a> of <a href="/wiki/Nuclear_magnetic_resonance" title="Nuclear magnetic resonance">nuclear magnetic resonance</a> in chemistry</li> <li>The relative <a href="/wiki/Electronegativity" title="Electronegativity">electronegativity</a> of different atoms in a molecule, δ<sup>−</sup> being more electronegative than δ<sup>+</sup></li> <li>Text requiring deletion in <a href="/wiki/Proofreading" title="Proofreading">proofreading</a>; the usage is said to date back to classical times</li> <li>In some of the manuscripts written by Dr. <a href="/wiki/John_Dee_(mathematician)" class="mw-redirect" title="John Dee (mathematician)">John Dee</a>, the character of delta is used to represent Dee</li> <li>A subunit of the F1 sector of the <a href="/wiki/F-ATPase" title="F-ATPase">F-ATPase</a></li> <li>The <a href="/wiki/Declination" title="Declination">declination</a> of an object in the <a href="/wiki/Equatorial_coordinate_system" title="Equatorial coordinate system">equatorial coordinate system</a> of <a href="/wiki/Astronomy" title="Astronomy">astronomy</a></li> <li>The dividend yield in the <a href="/wiki/Black%E2%80%93Scholes" class="mw-redirect" title="Black–Scholes">Black–Scholes</a> option pricing formula</li> <li>Ratios of <a href="/wiki/Environmental_isotopes" title="Environmental isotopes">environmental isotopes</a>, such as <a href="/wiki/Oxygen-18" title="Oxygen-18"><sup>18</sup>O</a>/<a href="/wiki/Oxygen-16" title="Oxygen-16"><sup>16</sup>O</a> and <a href="/wiki/Deuterium" title="Deuterium">D</a>/<a href="/wiki/Hydrogen-1" class="mw-redirect" title="Hydrogen-1"><sup>1</sup>H</a> from water are displayed using <a href="/wiki/Isotope_geochemistry" title="Isotope geochemistry">delta notation</a> – <a href="/wiki/%CE%9418O" title="Δ18O">δ<sup>18</sup>O</a> and <a href="/wiki/%CE%94D" class="mw-redirect" title="ΔD">δD</a>, respectively</li> <li>The rate of depreciation of the aggregate capital stock of an economy in an <a href="/wiki/Exogenous_growth_model" class="mw-redirect" title="Exogenous growth model">exogenous growth model</a> in <a href="/wiki/Macroeconomics" title="Macroeconomics">macroeconomics</a><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></li> <li>In a system that exhibits <a href="/wiki/Electrical_reactance" title="Electrical reactance">electrical reactance</a>, the angle between <a href="/wiki/Voltage" title="Voltage">voltage</a> and <a href="/wiki/Electric_current" title="Electric current">current</a></li> <li><a href="/wiki/Partial_charge" title="Partial charge">Partial charge</a> in chemistry</li> <li>The maximum <a href="/wiki/Birefringence" title="Birefringence">birefringence</a> of a crystal in <a href="/wiki/Optical_mineralogy" title="Optical mineralogy">optical mineralogy</a>.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></li> <li>An <a href="/wiki/Old_Irish" title="Old Irish">Old Irish</a> voiced dental or alveolar <a href="/wiki/Fricative" title="Fricative">fricative</a> of uncertain articulation, the ancestor of the sound represented by <a href="/wiki/Irish_language" title="Irish language">Modern Irish</a> <i>dh</i></li></ul> <div class="mw-heading mw-heading2"><h2 id="Unicode">Unicode</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Delta_(letter)&action=edit&section=4" title="Edit section: Unicode"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="nowrap"><style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><span class="monospaced">U+018D</span> </span><span style="font-size:125%;line-height:1em">ƍ</span> <span style="font-variant: small-caps; text-transform: lowercase;">LATIN SMALL LETTER TURNED DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+0394</span> </span><span style="font-size:125%;line-height:1em">Δ</span> <span style="font-variant: small-caps; text-transform: lowercase;">GREEK CAPITAL LETTER DELTA</span> (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">&Delta;</span>) (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">\Delta</span> in TeX)</li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+03B4</span> </span><span style="font-size:125%;line-height:1em">δ</span> <span style="font-variant: small-caps; text-transform: lowercase;">GREEK SMALL LETTER DELTA</span> (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">&delta;</span>) (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">\delta</span> in TeX)</li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D5F</span> </span><span style="font-size:125%;line-height:1em">ᵟ</span> <span style="font-variant: small-caps; text-transform: lowercase;">MODIFIER LETTER SMALL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1E9F</span> </span><span style="font-size:125%;line-height:1em">ẟ</span> <span style="font-variant: small-caps; text-transform: lowercase;">LATIN SMALL LETTER DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+2207</span> </span><span style="font-size:125%;line-height:1em">∇</span> <span style="font-variant: small-caps; text-transform: lowercase;">NABLA</span> (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">&Del;, &nabla;</span>)</li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+225C</span> </span><span style="font-size:125%;line-height:1em">≜</span> <span style="font-variant: small-caps; text-transform: lowercase;">DELTA EQUAL TO</span> (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">&triangleq;, &trie;</span>)</li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+234B</span> </span><span style="font-size:125%;line-height:1em">⍋</span> <span style="font-variant: small-caps; text-transform: lowercase;">APL FUNCTIONAL SYMBOL DELTA STILE</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+234D</span> </span><span style="font-size:125%;line-height:1em">⍍</span> <span style="font-variant: small-caps; text-transform: lowercase;">APL FUNCTIONAL SYMBOL QUAD DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+2359</span> </span><span style="font-size:125%;line-height:1em">⍙</span> <span style="font-variant: small-caps; text-transform: lowercase;">APL FUNCTIONAL SYMBOL DELTA UNDERBAR</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+2C86</span> </span><span style="font-size:125%;line-height:1em">Ⲇ</span> <span style="font-variant: small-caps; text-transform: lowercase;">COPTIC CAPITAL LETTER DALDA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+2C87</span> </span><span style="font-size:125%;line-height:1em">ⲇ</span> <span style="font-variant: small-caps; text-transform: lowercase;">COPTIC SMALL LETTER DALDA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+10384</span> </span><span style="font-size:125%;line-height:1em">𐎄</span> <span style="font-variant: small-caps; text-transform: lowercase;">UGARITIC LETTER DELTA</span></li></ul> <p>These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style: </p> <ul><li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D6AB</span> </span><span style="font-size:125%;line-height:1em">𝚫</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL BOLD CAPITAL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D6C5</span> </span><span style="font-size:125%;line-height:1em">𝛅</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL BOLD SMALL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D6E5</span> </span><span style="font-size:125%;line-height:1em">𝛥</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL ITALIC CAPITAL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D6FF</span> </span><span style="font-size:125%;line-height:1em">𝛿</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL ITALIC SMALL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D71F</span> </span><span style="font-size:125%;line-height:1em">𝜟</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL BOLD ITALIC CAPITAL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D739</span> </span><span style="font-size:125%;line-height:1em">𝜹</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL BOLD ITALIC SMALL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D759</span> </span><span style="font-size:125%;line-height:1em">𝝙</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL SANS-SERIF BOLD CAPITAL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D773</span> </span><span style="font-size:125%;line-height:1em">𝝳</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL SANS-SERIF BOLD SMALL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D793</span> </span><span style="font-size:125%;line-height:1em">𝞓</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL DELTA</span></li> <li><span class="nowrap"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">U+1D7AD</span> </span><span style="font-size:125%;line-height:1em">𝞭</span> <span style="font-variant: small-caps; text-transform: lowercase;">MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL DELTA</span></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Delta_(letter)&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/60px-Wiktionary-logo-en-v2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/80px-Wiktionary-logo-en-v2.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span></div> <div class="side-box-text plainlist">Look up <i><b><a href="https://en.wiktionary.org/wiki/%CE%94" class="extiw" title="wiktionary:Δ">Δ</a></b></i> or <i><b><a href="https://en.wiktionary.org/wiki/%CE%B4" class="extiw" title="wiktionary:δ">δ</a></b></i> in Wiktionary, the free dictionary.</div></div> </div> <ul><li><a href="/wiki/Arrow_(symbol)" title="Arrow (symbol)">Arrow (symbol)</a></li> <li><a href="/wiki/Chevron_(insignia)" title="Chevron (insignia)">Chevron (insignia)</a></li> <li><a href="/wiki/%E2%88%86_(disambiguation)" class="mw-redirect mw-disambig" title="∆ (disambiguation)">∆ (disambiguation)</a></li> <li><a href="/wiki/D" title="D">D, d</a></li> <li><a href="/wiki/De_(Cyrillic)" title="De (Cyrillic)">Д, д</a></li> <li><a href="/wiki/%E1%BA%9F" class="mw-redirect" title="ẟ">ẟ</a> - Latin delta</li> <li><a href="/wiki/%E2%88%82" title="∂">∂</a> - the <a href="/wiki/Partial_derivative" title="Partial derivative">partial derivative</a> symbol, a curved <i>d</i>, sometimes mistaken for a lowercase Greek letter Delta.</li> <li><a href="/wiki/%C3%90" class="mw-redirect" title="Ð">ð</a> - the small <a href="/wiki/Eth" title="Eth">eth</a> appears similar to a small delta and also represents a <i>d</i> sound in some contexts</li> <li><a href="/wiki/Th_(digraph)" title="Th (digraph)">Th (digraph)</a></li> <li><a href="/wiki/Thorn_(letter)" title="Thorn (letter)">Thorn (letter)</a></li> <li><a href="/wiki/Greek_letters_used_in_mathematics,_science,_and_engineering" title="Greek letters used in mathematics, science, and engineering">Greek letters used in mathematics, science, and engineering</a></li> <li>∇ - <a href="/wiki/Nabla_symbol" title="Nabla symbol">Nabla symbol</a></li> <li><a href="/wiki/Delta_Air_Lines" title="Delta Air Lines">Delta Air Lines</a></li> <li><a href="/wiki/SARS-CoV-2_Delta_variant" title="SARS-CoV-2 Delta variant">SARS-CoV-2 Delta variant</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Delta_(letter)&action=edit&section=6" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFReference-OED-delta" class="citation encyclopaedia cs1"><span class="id-lock-subscription" title="Paid subscription required"><a rel="nofollow" class="external text" href="https://www.oed.com/search/dictionary/?q=delta">"delta"</a></span>. <i><a href="/wiki/Oxford_English_Dictionary" title="Oxford English Dictionary">Oxford English Dictionary</a></i> (Online ed.). <a href="/wiki/Oxford_University_Press" title="Oxford University Press">Oxford University Press</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=delta&rft.btitle=Oxford+English+Dictionary&rft.edition=Online&rft.pub=Oxford+University+Press&rft_id=https%3A%2F%2Fwww.oed.com%2Fsearch%2Fdictionary%2F%3Fq%3Ddelta&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span> <span style="font-size:0.95em; font-size:95%; color: var( --color-subtle, #555 )">(Subscription or <a rel="nofollow" class="external text" href="https://www.oed.com/public/login/loggingin#withyourlibrary">participating institution membership</a> required.)</span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.greek-language.gr/greekLang/modern_greek/tools/lexica/triantafyllides/search.html?lq=%CE%B4%CE%AD%CE%BB%CF%84%CE%B1&dq=">"Dictionary of Standard Modern greek"</a>. Centre for the Greek Language.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Dictionary+of+Standard+Modern+greek&rft.pub=Centre+for+the+Greek+Language&rft_id=http%3A%2F%2Fwww.greek-language.gr%2FgreekLang%2Fmodern_greek%2Ftools%2Flexica%2Ftriantafyllides%2Fsearch.html%3Flq%3D%25CE%25B4%25CE%25AD%25CE%25BB%25CF%2584%25CE%25B1%26dq%3D&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.merriam-webster.com/dictionary/delta">"Definition of DELTA"</a>. <i>www.merriam-webster.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">26 October</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.merriam-webster.com&rft.atitle=Definition+of+DELTA&rft_id=http%3A%2F%2Fwww.merriam-webster.com%2Fdictionary%2Fdelta&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFCeloria1966" class="citation journal cs1">Celoria, Francis (1966). "Delta as a geographical concept in Greek literature". <i>Isis</i>. <b>57</b> (3): 385–388. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1086%2F350146">10.1086/350146</a>. <a href="/wiki/JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/228368">228368</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:143811840">143811840</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Isis&rft.atitle=Delta+as+a+geographical+concept+in+Greek+literature&rft.volume=57&rft.issue=3&rft.pages=385-388&rft.date=1966&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A143811840%23id-name%3DS2CID&rft_id=https%3A%2F%2Fwww.jstor.org%2Fstable%2F228368%23id-name%3DJSTOR&rft_id=info%3Adoi%2F10.1086%2F350146&rft.aulast=Celoria&rft.aufirst=Francis&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-Richardson1954-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-Richardson1954_5-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFClarence_H._Richardson1954" class="citation book cs1">Clarence H. Richardson (1954). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/introductiontoca00rich"><i><span></span></i>An Introduction to the Calculus of Finite Differences<i><span></span></i></a></span>. Van Nostrand. Chapter 1, pp. 1—3.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=An+Introduction+to+the+Calculus+of+Finite+Differences&rft.pages=Chapter+1%2C+pp.+1%E2%80%943&rft.pub=Van+Nostrand&rft.date=1954&rft.au=Clarence+H.+Richardson&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fintroductiontoca00rich&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span><a rel="nofollow" class="external text" href="http://babel.hathitrust.org/cgi/pt?id=mdp.39015000982945;view=1up;seq=5">online copy</a></span> </li> <li id="cite_note-Comenetz2002-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-Comenetz2002_6-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMichael_Comenetz2002" class="citation book cs1">Michael Comenetz (2002). <i>Calculus: The Elements</i>. World Scientific. pp. 73–74. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-981-02-4904-5" title="Special:BookSources/978-981-02-4904-5"><bdi>978-981-02-4904-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Calculus%3A+The+Elements&rft.pages=73-74&rft.pub=World+Scientific&rft.date=2002&rft.isbn=978-981-02-4904-5&rft.au=Michael+Comenetz&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDickensteinEmiris2005" class="citation book cs1"><a href="/wiki/Alicia_Dickenstein" title="Alicia Dickenstein">Dickenstein, Alicia</a>; Emiris, Ioannis Z. (2005). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=rSs-pQNrO_YC&pg=PA26"><i>Solving polynomial equations: foundations, algorithms, and applications</i></a>. Springer. Example 2.5.6, p. 120. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-3-540-24326-7" title="Special:BookSources/978-3-540-24326-7"><bdi>978-3-540-24326-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Solving+polynomial+equations%3A+foundations%2C+algorithms%2C+and+applications&rft.pages=Example+2.5.6%2C+p.+120&rft.pub=Springer&rft.date=2005&rft.isbn=978-3-540-24326-7&rft.aulast=Dickenstein&rft.aufirst=Alicia&rft.au=Emiris%2C+Ioannis+Z.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DrSs-pQNrO_YC%26pg%3DPA26&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFIrving2004" class="citation book cs1">Irving, Ronald S. (2004). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=B4k6ltaxm5YC&pg=PA154"><i>Integers, polynomials, and rings</i></a>. Springer-Verlag New York, Inc. Ch. 10.1, pp. 145. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-387-40397-7" title="Special:BookSources/978-0-387-40397-7"><bdi>978-0-387-40397-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Integers%2C+polynomials%2C+and+rings&rft.pages=Ch.+10.1%2C+pp.+145&rft.pub=Springer-Verlag+New+York%2C+Inc.&rft.date=2004&rft.isbn=978-0-387-40397-7&rft.aulast=Irving&rft.aufirst=Ronald+S.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DB4k6ltaxm5YC%26pg%3DPA154&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTepper2014" class="citation book cs1">Tepper, Pamela (2014). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=z9wbCgAAQBAJ"><i>The Law of Contracts and the Uniform Commercial Code</i></a>. Cengage Learning. p. 32. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1285448947" title="Special:BookSources/978-1285448947"><bdi>978-1285448947</bdi></a><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-04-30</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Law+of+Contracts+and+the+Uniform+Commercial+Code&rft.pages=32&rft.pub=Cengage+Learning&rft.date=2014&rft.isbn=978-1285448947&rft.aulast=Tepper&rft.aufirst=Pamela&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3Dz9wbCgAAQBAJ&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20121112073815/http://www.ada.org/2517.aspx?currentTab=2">"Caduceus, the emblem of dentistry"</a>. <i>American Dental Association</i>. Archived from <a rel="nofollow" class="external text" href="http://www.ada.org/2517.aspx?currentTab=2">the original</a> on 12 November 2012<span class="reference-accessdate">. Retrieved <span class="nowrap">26 October</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=American+Dental+Association&rft.atitle=Caduceus%2C+the+emblem+of+dentistry&rft_id=http%3A%2F%2Fwww.ada.org%2F2517.aspx%3FcurrentTab%3D2&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><a href="/wiki/Proceedings_of_the_Royal_Society" title="Proceedings of the Royal Society">Proceedings of the Royal Society</a>, vol. XIX, p. ii.</span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20220306070901/https://hsm.stackexchange.com/questions/5166/who-first-defined-the-equal-delta-or-delta-over-equal-triangleq-symbol">"Who first defined the "equal-delta" or "delta over equal" symbol?"</a>. Archived from <a rel="nofollow" class="external text" href="https://hsm.stackexchange.com/questions/5166/who-first-defined-the-equal-delta-or-delta-over-equal-triangleq-symbol">the original</a> on 6 March 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">2 October</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Who+first+defined+the+%22equal-delta%22+or+%22delta+over+equal%22+symbol%3F&rft_id=https%3A%2F%2Fhsm.stackexchange.com%2Fquestions%2F5166%2Fwho-first-defined-the-equal-delta-or-delta-over-equal-triangleq-symbol&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://econ.duke.edu/people?subpage=unit&Gurl=/aas/Economics&cname=Masters+Students">"Faculty - Economics Department"</a>. <i>econ.duke.edu</i><span class="reference-accessdate">. Retrieved <span class="nowrap">26 October</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=econ.duke.edu&rft.atitle=Faculty+-+Economics+Department&rft_id=http%3A%2F%2Fecon.duke.edu%2Fpeople%3Fsubpage%3Dunit%26Gurl%3D%2Faas%2FEconomics%26cname%3DMasters%2BStudents&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMACHADO,_Fábio_Braz2018" class="citation book cs1">MACHADO, Fábio Braz, NARDY, Antônio José Ranalli (2018). <i>Mineralogia Óptica</i>. São Paulo: Oficina de Textos. p. 85. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9788579752452" title="Special:BookSources/9788579752452"><bdi>9788579752452</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Mineralogia+%C3%93ptica&rft.place=S%C3%A3o+Paulo&rft.pages=85&rft.pub=Oficina+de+Textos&rft.date=2018&rft.isbn=9788579752452&rft.aulast=MACHADO%2C+F%C3%A1bio+Braz&rft.aufirst=NARDY%2C+Ant%C3%B4nio+Jos%C3%A9+Ranalli&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADelta+%28letter%29" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_book" title="Template:Cite book">cite book</a>}}</code>: CS1 maint: multiple names: authors list (<a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 maint: multiple names: authors list">link</a>)</span></span> </li> </ol></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Delta_(letter)&oldid=1254524965">https://en.wikipedia.org/w/index.php?title=Delta_(letter)&oldid=1254524965</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Category</a>: <ul><li><a href="/wiki/Category:Greek_letters" title="Category:Greek letters">Greek letters</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 maint: multiple names: authors list">CS1 maint: multiple names: authors list</a></li><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Articles_needing_additional_references_from_February_2015" title="Category:Articles needing additional references from February 2015">Articles needing additional references from February 2015</a></li><li><a href="/wiki/Category:All_articles_needing_additional_references" title="Category:All articles needing additional references">All articles needing additional references</a></li><li><a href="/wiki/Category:Articles_containing_Greek-language_text" title="Category:Articles containing Greek-language text">Articles containing Greek-language text</a></li><li><a href="/wiki/Category:Pages_with_Greek_IPA" title="Category:Pages with Greek IPA">Pages with Greek IPA</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 31 October 2024, at 12:23<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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