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data-event-name="pinnable-header.vector-toc.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">nascondi</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inizio</div> </a> </li> <li id="toc-Gli_usi" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Gli_usi"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Gli usi</span> </div> </a> <button aria-controls="toc-Gli_usi-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Attiva/disattiva la sottosezione Gli usi</span> </button> <ul id="toc-Gli_usi-sublist" class="vector-toc-list"> <li id="toc-In_economia" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_economia"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>In economia</span> </div> </a> <ul id="toc-In_economia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_informatica" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_informatica"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>In informatica</span> </div> </a> <ul id="toc-In_informatica-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_fisica" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_fisica"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>In fisica</span> </div> </a> <ul id="toc-In_fisica-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_chimica" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_chimica"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>In chimica</span> </div> </a> <ul id="toc-In_chimica-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_matematica" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_matematica"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.5</span> <span>In matematica</span> </div> </a> <ul id="toc-In_matematica-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_termodinamica" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_termodinamica"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.6</span> <span>In termodinamica</span> </div> </a> <ul id="toc-In_termodinamica-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Note" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Note"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Note</span> </div> </a> <ul id="toc-Note-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Altri_progetti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Altri_progetti"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Altri progetti</span> </div> </a> <ul id="toc-Altri_progetti-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Collegamenti_esterni" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Collegamenti_esterni"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Collegamenti esterni</span> </div> </a> <ul id="toc-Collegamenti_esterni-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indice" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostra/Nascondi l'indice" > <label 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">Mostra/Nascondi l'indice</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">Eta (lettera)</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="Vai a una voce in un'altra lingua. Disponibile in 86 lingue" > <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-86" 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">86 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ab mw-list-item"><a href="https://ab.wikipedia.org/wiki/%CE%97" title="Η - abcaso" lang="ab" hreflang="ab" data-title="Η" data-language-autonym="Аԥсшәа" data-language-local-name="abcaso" class="interlanguage-link-target"><span>Аԥсшәа</span></a></li><li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Eta_(letter)" title="Eta (letter) - afrikaans" lang="af" hreflang="af" data-title="Eta (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%97" title="Η - tedesco svizzero" lang="gsw" hreflang="gsw" data-title="Η" data-language-autonym="Alemannisch" data-language-local-name="tedesco svizzero" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A5%D8%AA%D8%A7_(%D8%AD%D8%B1%D9%81)" title="إتا (حرف) - arabo" lang="ar" hreflang="ar" data-title="إتا (حرف)" data-language-autonym="العربية" data-language-local-name="arabo" 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%97" title="Η - aramaico" lang="arc" hreflang="arc" data-title="Η" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="aramaico" 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/Eta_(lletra)" title="Eta (lletra) - asturiano" lang="ast" hreflang="ast" data-title="Eta (lletra)" data-language-autonym="Asturianu" data-language-local-name="asturiano" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Eta" title="Eta - bavarese" lang="bar" hreflang="bar" data-title="Eta" data-language-autonym="Boarisch" data-language-local-name="bavarese" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%AD%D1%82%D0%B0" title="Эта - bielorusso" lang="be" hreflang="be" data-title="Эта" data-language-autonym="Беларуская" data-language-local-name="bielorusso" 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%AD%D1%82%D0%B0_(%D0%BB%D1%96%D1%82%D0%B0%D1%80%D0%B0)" title="Эта (літара) - Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Эта (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%95%D1%82%D0%B0_(%D0%B1%D1%83%D0%BA%D0%B2%D0%B0)" title="Ета (буква) - bulgaro" lang="bg" hreflang="bg" data-title="Ета (буква)" data-language-autonym="Български" data-language-local-name="bulgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%87%E0%A6%9F%E0%A6%BE" title="ইটা - bengalese" lang="bn" hreflang="bn" data-title="ইটা" data-language-autonym="বাংলা" data-language-local-name="bengalese" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%A8%E0%BD%B2%E0%BD%A6%E0%BC%8B%E0%BD%90%E0%BC%8D" title="ཨིས་ཐ། - tibetano" lang="bo" hreflang="bo" data-title="ཨིས་ཐ།" data-language-autonym="བོད་ཡིག" data-language-local-name="tibetano" 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/Eta_(lizherenn)" title="Eta (lizherenn) - bretone" lang="br" hreflang="br" data-title="Eta (lizherenn)" data-language-autonym="Brezhoneg" data-language-local-name="bretone" 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/Eta" title="Eta - catalano" lang="ca" hreflang="ca" data-title="Eta" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/Eta" title="Eta - Mindong" lang="cdo" hreflang="cdo" data-title="Eta" 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-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%A6%DB%8C%D8%AA%D8%A7" title="ئیتا - curdo centrale" lang="ckb" hreflang="ckb" data-title="ئیتا" data-language-autonym="کوردی" data-language-local-name="curdo centrale" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/%C3%89ta" title="Éta - ceco" lang="cs" hreflang="cs" data-title="Éta" data-language-autonym="Čeština" data-language-local-name="ceco" 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/Eta_(llythyren)" title="Eta (llythyren) - gallese" lang="cy" hreflang="cy" data-title="Eta (llythyren)" data-language-autonym="Cymraeg" data-language-local-name="gallese" 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/Eta" title="Eta - danese" lang="da" hreflang="da" data-title="Eta" data-language-autonym="Dansk" data-language-local-name="danese" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Eta" title="Eta - tedesco" lang="de" hreflang="de" data-title="Eta" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/%CE%97" title="Η - Zazaki" lang="diq" hreflang="diq" data-title="Η" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%89%CF%84%CE%B1" title="Ήτα - greco" lang="el" hreflang="el" data-title="Ήτα" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Eta" title="Eta - inglese" lang="en" hreflang="en" data-title="Eta" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Eto_(litero)" title="Eto (litero) - esperanto" lang="eo" hreflang="eo" data-title="Eto (litero)" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/%CE%97" title="Η - spagnolo" lang="es" hreflang="es" data-title="Η" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Eeta" title="Eeta - estone" lang="et" hreflang="et" data-title="Eeta" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Eta_(hizkia)" title="Eta (hizkia) - basco" lang="eu" hreflang="eu" data-title="Eta (hizkia)" data-language-autonym="Euskara" data-language-local-name="basco" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Eta" title="Eta - estremegno" lang="ext" hreflang="ext" data-title="Eta" data-language-autonym="Estremeñu" data-language-local-name="estremegno" class="interlanguage-link-target"><span>Estremeñu</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D8%AA%D8%A7_(%D8%AD%D8%B1%D9%81)" title="اتا (حرف) - persiano" lang="fa" hreflang="fa" data-title="اتا (حرف)" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Eeta" title="Eeta - finlandese" lang="fi" hreflang="fi" data-title="Eeta" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fo mw-list-item"><a href="https://fo.wikipedia.org/wiki/Eta" title="Eta - faroese" lang="fo" hreflang="fo" data-title="Eta" 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/%C3%8Ata" title="Êta - francese" lang="fr" hreflang="fr" data-title="Êta" data-language-autonym="Français" data-language-local-name="francese" 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/%C3%89ite" title="Éite - irlandese" lang="ga" hreflang="ga" data-title="Éite" data-language-autonym="Gaeilge" data-language-local-name="irlandese" 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/Eta" title="Eta - gaelico scozzese" lang="gd" hreflang="gd" data-title="Eta" data-language-autonym="Gàidhlig" data-language-local-name="gaelico scozzese" 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/Eta" title="Eta - galiziano" lang="gl" hreflang="gl" data-title="Eta" data-language-autonym="Galego" data-language-local-name="galiziano" 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%97" title="Η - hakka" lang="hak" hreflang="hak" data-title="Η" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="hakka" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%98%D7%90" title="אטא - ebraico" lang="he" hreflang="he" data-title="אטא" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Eta" title="Eta - croato" lang="hr" hreflang="hr" data-title="Eta" data-language-autonym="Hrvatski" data-language-local-name="croato" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/%CE%97" title="Η - creolo haitiano" lang="ht" hreflang="ht" data-title="Η" data-language-autonym="Kreyòl ayisyen" data-language-local-name="creolo haitiano" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/%C3%89ta" title="Éta - ungherese" lang="hu" hreflang="hu" data-title="Éta" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B7%D5%BF%D5%A1_(%D5%BF%D5%A1%D5%BC)" title="Էտա (տառ) - armeno" lang="hy" hreflang="hy" data-title="Էտա (տառ)" data-language-autonym="Հայերեն" data-language-local-name="armeno" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Eta_(huruf_Yunani)" title="Eta (huruf Yunani) - indonesiano" lang="id" hreflang="id" data-title="Eta (huruf Yunani)" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" 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/Eta" title="Eta - islandese" lang="is" hreflang="is" data-title="Eta" data-language-autonym="Íslenska" data-language-local-name="islandese" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%CE%97" title="Η - giapponese" lang="ja" hreflang="ja" data-title="Η" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%94%E1%83%A2%E1%83%90_(%E1%83%90%E1%83%A1%E1%83%9D)" title="ეტა (ასო) - georgiano" lang="ka" hreflang="ka" data-title="ეტა (ასო)" data-language-autonym="ქართული" data-language-local-name="georgiano" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kge mw-list-item"><a href="https://kge.wikipedia.org/wiki/%CE%97_(Eta)" title="Η (Eta) - Komering" lang="kge" hreflang="kge" data-title="Η (Eta)" data-language-autonym="Kumoring" data-language-local-name="Komering" class="interlanguage-link-target"><span>Kumoring</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%CE%97" title="Η - coreano" lang="ko" hreflang="ko" data-title="Η" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Eta" title="Eta - curdo" lang="ku" hreflang="ku" data-title="Eta" data-language-autonym="Kurdî" data-language-local-name="curdo" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-kv mw-list-item"><a href="https://kv.wikipedia.org/wiki/%D0%AD%D1%82%D0%B0" title="Эта - komi" lang="kv" hreflang="kv" data-title="Эта" data-language-autonym="Коми" data-language-local-name="komi" class="interlanguage-link-target"><span>Коми</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Eta_(littera)" title="Eta (littera) - latino" lang="la" hreflang="la" data-title="Eta (littera)" data-language-autonym="Latina" data-language-local-name="latino" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Eta" title="Eta - lussemburghese" lang="lb" hreflang="lb" data-title="Eta" data-language-autonym="Lëtzebuergesch" data-language-local-name="lussemburghese" 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%AD%D1%82%D0%B0" title="Эта - lesgo" lang="lez" hreflang="lez" data-title="Эта" data-language-autonym="Лезги" data-language-local-name="lesgo" 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/Eta_(raid%C4%97)" title="Eta (raidė) - lituano" lang="lt" hreflang="lt" data-title="Eta (raidė)" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/%C4%92ta" title="Ēta - lettone" lang="lv" hreflang="lv" data-title="Ēta" data-language-autonym="Latviešu" data-language-local-name="lettone" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%88%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="ഈറ്റ (അക്ഷരം) - malayalam" lang="ml" hreflang="ml" data-title="ഈറ്റ (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%88%E0%A4%9F%E0%A4%BE" title="ईटा - marathi" lang="mr" hreflang="mr" data-title="ईटा" 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/Eta" title="Eta - malese" lang="ms" hreflang="ms" data-title="Eta" data-language-autonym="Bahasa Melayu" data-language-local-name="malese" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nah mw-list-item"><a href="https://nah.wikipedia.org/wiki/%CE%97" title="Η - Nahuatl" lang="nah" hreflang="nah" data-title="Η" data-language-autonym="Nāhuatl" data-language-local-name="Nahuatl" class="interlanguage-link-target"><span>Nāhuatl</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Eta" title="Eta - basso tedesco" lang="nds" hreflang="nds" data-title="Eta" data-language-autonym="Plattdüütsch" data-language-local-name="basso tedesco" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/%C3%88ta" title="Èta - olandese" lang="nl" hreflang="nl" data-title="Èta" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Eta" title="Eta - norvegese nynorsk" lang="nn" hreflang="nn" data-title="Eta" data-language-autonym="Norsk nynorsk" data-language-local-name="norvegese nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Eta_(bokstav)" title="Eta (bokstav) - norvegese bokmål" lang="nb" hreflang="nb" data-title="Eta (bokstav)" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/%C3%88ta" title="Èta - occitano" lang="oc" hreflang="oc" data-title="Èta" data-language-autonym="Occitan" data-language-local-name="occitano" 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%88%E0%A8%9F%E0%A8%BE" title="ਈਟਾ - punjabi" lang="pa" hreflang="pa" data-title="ਈਟਾ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Eta" title="Eta - polacco" lang="pl" hreflang="pl" data-title="Eta" data-language-autonym="Polski" data-language-local-name="polacco" 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%97" title="Η - portoghese" lang="pt" hreflang="pt" data-title="Η" data-language-autonym="Português" data-language-local-name="portoghese" 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/Eta_(liter%C4%83)" title="Eta (literă) - rumeno" lang="ro" hreflang="ro" data-title="Eta (literă)" data-language-autonym="Română" data-language-local-name="rumeno" 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%AD%D1%82%D0%B0" title="Эта - russo" lang="ru" hreflang="ru" data-title="Эта" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-se mw-list-item"><a href="https://se.wikipedia.org/wiki/%CE%97" title="Η - sami del nord" lang="se" hreflang="se" data-title="Η" data-language-autonym="Davvisámegiella" data-language-local-name="sami del nord" class="interlanguage-link-target"><span>Davvisámegiella</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Eta" title="Eta - serbo-croato" lang="sh" hreflang="sh" data-title="Eta" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croato" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Eta" title="Eta - Simple English" lang="en-simple" hreflang="en-simple" data-title="Eta" 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/%C3%89ta" title="Éta - slovacco" lang="sk" hreflang="sk" data-title="Éta" data-language-autonym="Slovenčina" data-language-local-name="slovacco" 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/Eta_(%C4%8Drka)" title="Eta (črka) - sloveno" lang="sl" hreflang="sl" data-title="Eta (črka)" data-language-autonym="Slovenščina" data-language-local-name="sloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%95%D1%82%D0%B0_(%D1%81%D0%BB%D0%BE%D0%B2%D0%BE)" title="Ета (слово) - serbo" lang="sr" hreflang="sr" data-title="Ета (слово)" data-language-autonym="Српски / srpski" data-language-local-name="serbo" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Eta" title="Eta - svedese" lang="sv" hreflang="sv" data-title="Eta" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Eta" title="Eta - swahili" lang="sw" hreflang="sw" data-title="Eta" data-language-autonym="Kiswahili" data-language-local-name="swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B5%E0%B8%95%E0%B8%B2" title="อีตา - thailandese" lang="th" hreflang="th" data-title="อีตา" data-language-autonym="ไทย" data-language-local-name="thailandese" 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/%C4%B0ta" title="İta - turco" lang="tr" hreflang="tr" data-title="İta" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%95%D1%82%D0%B0_(%D0%BB%D1%96%D1%82%D0%B5%D1%80%D0%B0)" title="Ета (літера) - ucraino" lang="uk" hreflang="uk" data-title="Ета (літера)" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/Eta" title="Eta - vepso" lang="vep" hreflang="vep" data-title="Eta" data-language-autonym="Vepsän kel’" data-language-local-name="vepso" 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/Eta" title="Eta - vietnamita" lang="vi" hreflang="vi" data-title="Eta" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" 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/Eta" title="Eta - waray" lang="war" hreflang="war" data-title="Eta" 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%97" title="Η - wu" lang="wuu" hreflang="wuu" data-title="Η" 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-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%CE%97" title="Η - cinese" lang="zh" hreflang="zh" data-title="Η" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/%CE%97" title="Η - min nan" lang="nan" hreflang="nan" data-title="Η" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="min nan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%CE%97" title="Η - cantonese" lang="yue" hreflang="yue" data-title="Η" data-language-autonym="粵語" data-language-local-name="cantonese" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q14396#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespace"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Eta_(lettera)" 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</div> </div> </div> </div> <table class="noprint" style="width:15.0em !important; border-radius:0.5em; -moz-border-radius:0.5em; border:1px solid #AAA; float:right; font-size:13px; background-color:#FFF; margin-bottom: 1em; margin-left: 1em;" cellspacing="5"> <tbody><tr> <td colspan="4" style="text-align:center; padding:0.5em 0em;"><span typeof="mw:File"><a href="/wiki/File:Eta_uc_lc.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Eta_uc_lc.svg/160px-Eta_uc_lc.svg.png" decoding="async" width="160" height="107" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Eta_uc_lc.svg/240px-Eta_uc_lc.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Eta_uc_lc.svg/320px-Eta_uc_lc.svg.png 2x" data-file-width="3000" data-file-height="2000" /></a></span> </td></tr> <tr> <th bgcolor="#ccccff" colspan="4" style="text-align:center; padding:0.4em 0em; border-radius:0.4em; -moz-border-radius:0.4em; font-size:100%"><a href="/wiki/Alfabeto_greco#Lettere_classiche" title="Alfabeto greco">Lettere classiche</a> </th></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Αα</b></td> <td><a href="/wiki/Alfa_(lettera)" title="Alfa (lettera)">Alfa</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Νν</b></td> <td><a href="/wiki/Ni_(lettera)" title="Ni (lettera)">Ni</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ββ</b></td> <td><a href="/wiki/Beta" title="Beta">Beta</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ξξ</b></td> <td><a href="/wiki/Xi_(lettera)" title="Xi (lettera)">Xi</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Γγ</b></td> <td><a href="/wiki/Gamma_(lettera)" title="Gamma (lettera)">Gamma</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Οο</b></td> <td><a href="/wiki/Omicron" title="Omicron">Omicron</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Δδ</b></td> <td><a href="/wiki/Delta_(lettera)" title="Delta (lettera)">Delta</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ππ</b></td> <td><a href="/wiki/Pi_(lettera_greca)" title="Pi (lettera greca)">Pi</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Εε</b></td> <td><a href="/wiki/Epsilon" title="Epsilon">Epsilon</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ρρ</b></td> <td><a href="/wiki/Rho_(lettera)" title="Rho (lettera)">Rho</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ζζ</b></td> <td><a href="/wiki/Zeta_(lettera_greca)" title="Zeta (lettera greca)">Zeta</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Σσς</b></td> <td><a href="/wiki/Sigma" title="Sigma">Sigma</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ηη</b></td> <td><a class="mw-selflink selflink">Eta</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ττ</b></td> <td><a href="/wiki/Tau" title="Tau">Tau</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Θθ</b></td> <td><a href="/wiki/Theta" title="Theta">Theta</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Υυ</b></td> <td><a href="/wiki/Ypsilon" title="Ypsilon">Ypsilon</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ιι</b></td> <td><a href="/wiki/Iota" title="Iota">Iota</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Φφ</b></td> <td><a href="/wiki/Phi_(lettera)" title="Phi (lettera)">Phi</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Κκ</b></td> <td><a href="/wiki/Kappa_(lettera_greca)" title="Kappa (lettera greca)">Kappa</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Χχ</b></td> <td><a href="/wiki/Chi_(lettera)" title="Chi (lettera)">Chi</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Λλ</b></td> <td><a href="/wiki/Lambda" title="Lambda">Lambda</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ψψ</b></td> <td><a href="/wiki/Psi_(lettera)" title="Psi (lettera)">Psi</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Μμ</b></td> <td><a href="/wiki/Mi_(lettera)" title="Mi (lettera)">Mi</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ωω</b></td> <td><a href="/wiki/Omega" title="Omega">Omega</a> </td></tr> <tr> <th bgcolor="#ccccff" colspan="4" style="text-align:center; padding:0.4em 0em; border-radius:0.4em; -moz-border-radius:0.4em;"><a href="/wiki/Alfabeto_greco#Lettere_numerali" title="Alfabeto greco">Lettere numerali</a> </th></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϛϛ</b></td> <td><a href="/wiki/Stigma_(lettera)" title="Stigma (lettera)">Stigma</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϡϡ</b></td> <td><a href="/wiki/Sampi" title="Sampi">Sampi</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϟϟ</b></td> <td><a href="/wiki/Qoppa" title="Qoppa">Qoppa</a> </td></tr> <tr> <th bgcolor="#ccccff" colspan="4" style="text-align:center; padding:0.4em 0em; border-radius:0.4em; -moz-border-radius:0.4em;"><a href="/wiki/Alfabeto_greco#Lettere_arcaiche" title="Alfabeto greco">Lettere arcaiche</a> </th></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϝϝ</b></td> <td><a href="/wiki/Digamma" title="Digamma">Digamma</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϻϻ</b></td> <td><a href="/wiki/San_(lettera)" title="San (lettera)">San</a> </td></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ͱͱ</b></td> <td><a href="/wiki/Heta_(lettera)" title="Heta (lettera)">Heta</a> </td></tr> <tr> <th bgcolor="#ccccff" colspan="4" style="text-align:center; padding:0.4em 0em; border-radius:0.4em; -moz-border-radius:0.4em;"><a href="/wiki/Alfabeto_greco#Altri_caratteri" title="Alfabeto greco">Altri caratteri</a> </th></tr> <tr> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϳϳ</b></td> <td><a href="/wiki/Jod" title="Jod">Jod</a> </td> <td style="font-family:Times New Roman, serif; font-size:1.2em;"><b>Ϸϸ</b></td> <td><a href="/wiki/Sho_(lettera)" title="Sho (lettera)">Sho</a> </td></tr> <tr> <td colspan="4"><hr /> </td></tr> <tr> <td align="center" colspan="4" style="font-size:85%;"><a href="/wiki/Segni_diacritici_dell%27alfabeto_greco" title="Segni diacritici dell'alfabeto greco">Segni diacritici</a> </td></tr> </tbody></table> <p><b>Eta</b> (<b>Η</b>; <b>η</b>) è la settima <a href="/wiki/Lettera_alfabetica" class="mw-redirect" title="Lettera alfabetica">lettera</a> dell'<a href="/wiki/Alfabeto_greco" title="Alfabeto greco">alfabeto greco</a>. È una delle sette vocali: contrariamente alla lettera <a href="/wiki/Epsilon_(lettera)" class="mw-redirect" title="Epsilon (lettera)">ε</a>, la sua <a href="/wiki/Quantit%C3%A0_vocalica" title="Quantità vocalica">quantità</a> è sempre lunga. Nel sistema numerico del greco antico aveva valore <a href="/wiki/8_(numero)" title="8 (numero)">8</a>. </p><p>Questa lettera deriva probabilmente dalla <a href="/wiki/Alfabeto_fenicio" title="Alfabeto fenicio">lettera fenicia</a> <span class="noviewer" typeof="mw:File"><a href="/wiki/File:Phoenician_heth.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Phoenician_heth.svg/19px-Phoenician_heth.svg.png" decoding="async" width="19" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Phoenician_heth.svg/29px-Phoenician_heth.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Phoenician_heth.svg/38px-Phoenician_heth.svg.png 2x" data-file-width="85" data-file-height="85" /></a></span> (<i><a href="/wiki/Heth" title="Heth">heth</a></i>), ed è a sua volta all'origine della <a href="/wiki/Alfabeto_latino" title="Alfabeto latino">latina</a> <a href="/wiki/H" title="H">H</a> e della <a href="/wiki/Alfabeto_cirillico" title="Alfabeto cirillico">cirillica</a> <a href="/wiki/%D0%98" title="И">И</a>. </p><p>La pronuncia di questa lettera, detta ἦτα, nell'<a href="/wiki/Antica_Grecia" title="Antica Grecia">antica Grecia</a> era una <i>e</i> aperta lunga <a href="/wiki/Alfabeto_fonetico_internazionale" title="Alfabeto fonetico internazionale">/ɛː/</a>. In origine, come ad esempio nell'<a href="/wiki/Alfabeto_attico" title="Alfabeto attico">alfabeto originario del dialetto attico</a> (che poi adottò l'alfabeto ionico, il tipo oggi comune), trascriveva una fricativa laringale sorda <a href="/wiki/Alfabeto_fonetico_internazionale" title="Alfabeto fonetico internazionale">/h/</a> ed è appunto con questa funzione (tramite le colonie greche della <a href="/wiki/Magna_Grecia" title="Magna Grecia">Magna Grecia</a>) che è passata all'alfabeto latino come <a href="/wiki/H" title="H">H</a>; da questo uso, il segno si è evoluto negli spiriti <a href="/wiki/Spirito_aspro" title="Spirito aspro">aspro</a> e <a href="/wiki/Spirito_dolce" title="Spirito dolce">dolce</a>. Durante i primi secoli d.C. si generalizzò la pronuncia <a href="/wiki/Aiuto:IPA" title="Aiuto:IPA"><span title="Questa è una trascrizione IPA della pronuncia. Vedere l'alfabeto fonetico internazionale." class="IPA">[i]</span></a> che ritroviamo nel greco moderno. </p><p>Proprio questa lettera dà il nome a due correnti di pronuncia del <a href="/wiki/Lingua_greca_antica" title="Lingua greca antica">greco antico</a>, quella <i>itacistica</i> e quella <i>etacistica</i>. La prima fu difesa da <a href="/wiki/Johannes_Reuchlin" title="Johannes Reuchlin">Johannes Reuchlin</a>, e corrispondeva all'uso dei greci nel Rinascimento (che era già <a href="/wiki/Lingua_greca_moderna" title="Lingua greca moderna">quello moderno</a>), l'altra fu il frutto delle ricerche di <a href="/wiki/Erasmo_da_Rotterdam" title="Erasmo da Rotterdam">Erasmo da Rotterdam</a>, che ricostruì, anche se non del tutto correttamente, la pronuncia del greco dell'epoca classica. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Gli_usi">Gli usi</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=1" title="Modifica la sezione Gli usi" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=1" title="Edit section's source code: Gli usi"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r139255918">.mw-parser-output .avviso-mini{border:1px solid #aaa;background-color:#fbfbfb;margin-bottom:.5em;padding:0 2px 0 3px;margin:5px 10%;font-size:90%}.mw-parser-output .avviso-mini>div:first-of-type{margin:2px 2px 2px 0}.mw-parser-output .avviso-mini .mw-collapsible-content{padding:2px 0 0 7px}.mw-parser-output .avviso-mini-informazioni{border-left:10px solid #1e90ff}.mw-parser-output .avviso-mini-contenuto{border-left:10px solid #f28500}.mw-parser-output .avviso-mini-stile{border-left:10px solid #f4c430}.mw-parser-output .avviso-mini-statico{border-left:10px solid limegreen}.mw-parser-output .avviso-mini-struttura{border-left:10px solid #9932cc}.mw-parser-output .avviso-mini-generico{border-left:10px solid #bba}body.skin-minerva .mw-parser-output .avviso-mini{border:none;margin-bottom:1px;padding:inherit}body.skin-minerva .mw-parser-output .avviso-mini .mbox-text-div{font-style:normal}html.client-js body.skin-minerva .mw-parser-output .avviso-mini>div{padding:8px 8px 8px 32px!important;position:relative}</style><div class="ambox avviso-mini noprint metadata avviso-mini-generico plainlinks"> <div class="mbox-text"> <div class="mbox-text-div" style="display:flex; flex-direction:row; align-items:center; column-gap:5px;"><span class="mbox-image"><span typeof="mw:File"><span title="Abbozzo linguistica"><img alt="Abbozzo linguistica" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Crystal128-kanagram.svg/25px-Crystal128-kanagram.svg.png" decoding="async" width="25" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Crystal128-kanagram.svg/38px-Crystal128-kanagram.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Crystal128-kanagram.svg/50px-Crystal128-kanagram.svg.png 2x" data-file-width="256" data-file-height="256" /></span></span></span><span style="width:100%"><b>Questa sezione  sull'argomento linguistica è solo un <a href="/wiki/Aiuto:Abbozzo" title="Aiuto:Abbozzo">abbozzo</a></b>. <a class="external text" href="https://it.wikipedia.org/w/index.php?title=Eta_(lettera)&action=edit">Contribuisci</a> a migliorarla secondo le <a href="/wiki/Aiuto:Manuale_di_stile" title="Aiuto:Manuale di stile">convenzioni di Wikipedia</a>. Segui i suggerimenti del <a href="/wiki/Progetto:Linguistica" title="Progetto:Linguistica">progetto di riferimento</a>.</span></div> </div> </div> <div class="mw-heading mw-heading3"><h3 id="In_economia">In economia</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=2" title="Modifica la sezione In economia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=2" title="Edit section's source code: In economia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>In economia si utilizza la lettera <b>η</b> per indicare l'<a href="/wiki/Elasticit%C3%A0_dell%27offerta_rispetto_al_prezzo" class="mw-redirect" title="Elasticità dell'offerta rispetto al prezzo">elasticità dell'offerta rispetto al prezzo</a>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="In_informatica">In informatica</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=3" title="Modifica la sezione In informatica" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=3" title="Edit section's source code: In informatica"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/w/index.php?title=ETA_(linguaggio_di_programmazione)&action=edit&redlink=1" class="new" title="ETA (linguaggio di programmazione) (la pagina non esiste)">ETA</a> è un linguaggio di programmazione.</li> <li>Nell'ambito delle <a href="/wiki/Reti_neurali" class="mw-redirect" title="Reti neurali">reti neurali</a> la costante <b>η</b> indica il tasso di apprendimento.</li> <li>Nella programmazione la lettera <b>η</b> è spesso usata per indicare l'efficienza di un algoritmo. Un esempio di tale uso può essere trovato in libri di testo riguardanti lo studio di <a href="/wiki/Algoritmo_di_ordinamento" title="Algoritmo di ordinamento">Algoritmi e Strutture Dati</a>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="In_fisica">In fisica</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=4" title="Modifica la sezione In fisica" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=4" title="Edit section's source code: In fisica"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Si usa per indicare la <a href="/wiki/Viscosit%C3%A0" title="Viscosità">viscosità</a> di un fluido.</li></ul> <div class="mw-heading mw-heading3"><h3 id="In_chimica">In chimica</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=5" title="Modifica la sezione In chimica" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=5" title="Edit section's source code: In chimica"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Si usa per indicare l'<a href="/wiki/Apticit%C3%A0" title="Apticità">apticità</a> di un <a href="/wiki/Ligando" title="Ligando">ligando</a>, scrivendola in corsivo, e la quantifica scrivendo il relativo numero <i>n</i> ad esponente.<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> Per indicare il <a href="/wiki/Ferrocene" title="Ferrocene">ferrocene</a>, ad esempio, si scrive Fe(<i>η</i><sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub> e, per il <a href="/wiki/Dibenzenecromo" title="Dibenzenecromo">dibenzenecromo</a>, Cr(<i>η</i><sup>6</sup>-C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="In_matematica">In matematica</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=6" title="Modifica la sezione In matematica" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=6" title="Edit section's source code: In matematica"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>In matematica è presente una <a href="/wiki/Funzione_eta_di_Dirichlet" title="Funzione eta di Dirichlet">funzione eta di Dirichlet</a>, molto simile alla <a href="/wiki/Funzione_zeta_di_Riemann" title="Funzione zeta di Riemann">funzione zeta di Riemann</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="In_termodinamica">In termodinamica</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=7" title="Modifica la sezione In termodinamica" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=7" title="Edit section's source code: In termodinamica"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>In termodinamica si utilizza la lettera <b>η</b> per indicare il <a href="/wiki/Rendimento_(termodinamica)" title="Rendimento (termodinamica)">rendimento</a> o efficienza termodinamica.</li> <li>Inoltre, la lettera <b>η</b> può indicare anche la sovratensione di un elettrodo, cioè la differenza fra il suo potenziale istantaneo ed il suo potenziale di equilibrio.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=8" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=8" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text"><cite class="citation libro" style="font-style:normal"> J. E. Huheey, E. A. Keiter e R. L. Keiter, <span style="font-style:italic;">15 - Chimica organometallica</span>, in <span style="font-style:italic;">Chimica Inorganica</span>, Seconda edizione italiana, sulla quarta edizione inglese, Padova, Piccin Nuova Libraria, 1999, pp. 659-660, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/88-299-1470-3" title="Speciale:RicercaISBN/88-299-1470-3">88-299-1470-3</a>.</cite></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=9" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=9" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Alfabeto_greco" title="Alfabeto greco">Alfabeto greco</a></li> <li><a href="/wiki/Quantit%C3%A0_vocalica" title="Quantità vocalica">Quantità vocalica</a></li> <li><a href="/wiki/H" title="H">H</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=10" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=10" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; color: black; font-weight: bold; margin: 0"><span>Altri progetti</span></p><ul title="Collegamenti verso gli altri progetti Wikimedia"> <li class="" title=""><span class="plainlinks" title="commons:Category:Eta (letter)"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Eta_(letter)?uselang=it">Wikimedia Commons</a></span></li></ul></div> <ul><li><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/?uselang=it" title="Collabora a Wikimedia Commons"><img alt="Collabora a Wikimedia Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png" decoding="async" width="18" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/27px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/36px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/?uselang=it">Wikimedia Commons</a></span> contiene immagini o altri file su <b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Eta_(letter)?uselang=it">Eta</a></span></b></li></ul> <div class="mw-heading mw-heading2"><h2 id="Collegamenti_esterni">Collegamenti esterni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Eta_(lettera)&veaction=edit&section=11" title="Modifica la sezione Collegamenti esterni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Eta_(lettera)&action=edit&section=11" title="Edit section's source code: Collegamenti esterni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li class="mw-empty-elt"></li> <li><cite id="CITEREFSapere.it" class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="https://www.sapere.it/enciclopedia/èta.html"><span style="font-style:italic;">èta</span></a>, su <span style="font-style:italic;">sapere.it</span>, <a href="/wiki/De_Agostini" title="De Agostini">De Agostini</a>.</cite> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q14396#P6706" title="Modifica su Wikidata"><img alt="Modifica su Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/10px-Blue_pencil.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/15px-Blue_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/20px-Blue_pencil.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></li></ul> <div class="noprint" style="width:100%; padding: 3px 0; display: flex; flex-wrap: wrap; row-gap: 4px; column-gap: 8px; box-sizing: border-box;"><div style="flex-grow: 1"><style data-mw-deduplicate="TemplateStyles:r140555418">.mw-parser-output .itwiki-template-occhiello{width:100%;line-height:25px;border:1px solid #CCF;background-color:#F0EEFF;box-sizing:border-box}.mw-parser-output .itwiki-template-occhiello-progetto{background-color:#FAFAFA}@media screen{html.skin-theme-clientpref-night .mw-parser-output .itwiki-template-occhiello{background-color:#202122;border-color:#54595D}html.skin-theme-clientpref-night .mw-parser-output .itwiki-template-occhiello-progetto{background-color:#282929}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .itwiki-template-occhiello{background-color:#202122;border-color:#54595D}html.skin-theme-clientpref-os .mw-parser-output .itwiki-template-occhiello-progetto{background-color:#282929}}</style><div class="itwiki-template-occhiello"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Crystal128-kanagram.svg" class="mw-file-description" title="Linguistica"><img alt=" " src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Crystal128-kanagram.svg/25px-Crystal128-kanagram.svg.png" decoding="async" width="25" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Crystal128-kanagram.svg/38px-Crystal128-kanagram.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Crystal128-kanagram.svg/50px-Crystal128-kanagram.svg.png 2x" data-file-width="256" data-file-height="256" /></a></span> <b><a href="/wiki/Portale:Linguistica" title="Portale:Linguistica">Portale Linguistica</a></b>: accedi alle voci di Wikipedia che trattano di linguistica</div></div></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="">Estratto da "<a dir="ltr" href="https://it.wikipedia.org/w/index.php?title=Eta_(lettera)&oldid=141112107">https://it.wikipedia.org/w/index.php?title=Eta_(lettera)&oldid=141112107</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Categoria:Categorie" title="Categoria:Categorie">Categoria</a>: <ul><li><a href="/wiki/Categoria:Lettere_dell%27alfabeto_greco" title="Categoria:Lettere dell'alfabeto greco">Lettere dell'alfabeto greco</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Categorie nascoste: <ul><li><a href="/wiki/Categoria:Senza_fonti_-_grafemi" title="Categoria:Senza fonti - grafemi">Senza fonti - grafemi</a></li><li><a href="/wiki/Categoria:Senza_fonti_-_marzo_2019" title="Categoria:Senza fonti - marzo 2019">Senza fonti - marzo 2019</a></li><li><a href="/wiki/Categoria:Stub_sezione_-_linguistica" title="Categoria:Stub sezione - linguistica">Stub sezione - linguistica</a></li><li><a href="/wiki/Categoria:P6706_letta_da_Wikidata" title="Categoria:P6706 letta da Wikidata">P6706 letta da Wikidata</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"> Questa pagina è stata modificata per l'ultima volta il 14 set 2024 alle 16:22.</li> <li id="footer-info-copyright">Il testo è disponibile secondo la <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.it">licenza Creative Commons Attribuzione-Condividi allo stesso modo</a>; 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