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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">序言</div> </a> </li> <li id="toc-用作双倍π" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#用作双倍π"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>用作双倍π</span> </div> </a> <ul id="toc-用作双倍π-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-參考" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#參考"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>參考</span> </div> </a> <ul id="toc-參考-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="目录" 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="开关目录" > <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">开关目录</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">Τ</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="前往另一种语言写成的文章。86种语言可用" > <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种语言</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%A4" title="Τ – 阿布哈西亚语" lang="ab" hreflang="ab" data-title="Τ" data-language-autonym="Аԥсшәа" data-language-local-name="阿布哈西亚语" 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/Tau" title="Tau – 南非荷兰语" lang="af" hreflang="af" data-title="Tau" data-language-autonym="Afrikaans" data-language-local-name="南非荷兰语" 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%A4" title="Τ – 瑞士德语" lang="gsw" hreflang="gsw" data-title="Τ" data-language-autonym="Alemannisch" data-language-local-name="瑞士德语" 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%AA%D8%A7%D9%88" title="تاو – 阿拉伯语" lang="ar" hreflang="ar" data-title="تاو" data-language-autonym="العربية" data-language-local-name="阿拉伯语" 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%A4" title="Τ – 阿拉米语" lang="arc" hreflang="arc" data-title="Τ" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="阿拉米语" class="interlanguage-link-target"><span>ܐܪܡܝܐ</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Tau_(Buchstabe)" title="Tau (Buchstabe) – 巴伐利亞文" lang="bar" hreflang="bar" data-title="Tau (Buchstabe)" data-language-autonym="Boarisch" data-language-local-name="巴伐利亞文" 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%A2%D0%B0%D1%83" title="Тау – 白俄罗斯语" lang="be" hreflang="be" data-title="Тау" data-language-autonym="Беларуская" data-language-local-name="白俄罗斯语" 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%A2%D0%B0%D1%9E_(%D0%BB%D1%96%D1%82%D0%B0%D1%80%D0%B0)" title="Таў (літара) – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Таў (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%A2%D0%B0%D1%83" title="Тау – 保加利亚语" lang="bg" hreflang="bg" data-title="Тау" data-language-autonym="Български" data-language-local-name="保加利亚语" 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%9F%E0%A6%BE%E0%A6%89" title="টাউ – 孟加拉语" lang="bn" hreflang="bn" data-title="টাউ" data-language-autonym="বাংলা" data-language-local-name="孟加拉语" 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%90%E0%BD%BC%E0%BC%8D" title="ཐོ། – 藏语" lang="bo" hreflang="bo" data-title="ཐོ།" data-language-autonym="བོད་ཡིག" data-language-local-name="藏语" 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/Tau_(lizherenn)" title="Tau (lizherenn) – 布列塔尼语" lang="br" hreflang="br" data-title="Tau (lizherenn)" data-language-autonym="Brezhoneg" data-language-local-name="布列塔尼语" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Tau" title="Tau – 波斯尼亚语" lang="bs" hreflang="bs" data-title="Tau" data-language-autonym="Bosanski" data-language-local-name="波斯尼亚语" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Tau_(lletra_grega)" title="Tau (lletra grega) – 加泰罗尼亚语" lang="ca" hreflang="ca" data-title="Tau (lletra grega)" data-language-autonym="Català" data-language-local-name="加泰罗尼亚语" 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/Tau" title="Tau – Mindong" lang="cdo" hreflang="cdo" data-title="Tau" 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%AA%D8%A7%D9%88" title="تاو – 中库尔德语" lang="ckb" hreflang="ckb" data-title="تاو" data-language-autonym="کوردی" data-language-local-name="中库尔德语" 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/Tau_(p%C3%ADsmeno)" title="Tau (písmeno) – 捷克语" lang="cs" hreflang="cs" data-title="Tau (písmeno)" data-language-autonym="Čeština" data-language-local-name="捷克语" 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/Tau_(llythyren)" title="Tau (llythyren) – 威尔士语" lang="cy" hreflang="cy" data-title="Tau (llythyren)" data-language-autonym="Cymraeg" data-language-local-name="威尔士语" 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/Tau_(bogstav)" title="Tau (bogstav) – 丹麦语" lang="da" hreflang="da" data-title="Tau (bogstav)" data-language-autonym="Dansk" data-language-local-name="丹麦语" 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/Tau_(Buchstabe)" title="Tau (Buchstabe) – 德语" lang="de" hreflang="de" data-title="Tau (Buchstabe)" data-language-autonym="Deutsch" data-language-local-name="德语" 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%A4" title="Τ – Zazaki" lang="diq" hreflang="diq" data-title="Τ" 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%A4%CE%B1%CF%85" title="Ταυ – 希腊语" lang="el" hreflang="el" data-title="Ταυ" data-language-autonym="Ελληνικά" data-language-local-name="希腊语" 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/Tau" title="Tau – 英语" lang="en" hreflang="en" data-title="Tau" data-language-autonym="English" data-language-local-name="英语" 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/Ta%C5%ADo_(litero)" title="Taŭo (litero) – 世界语" lang="eo" hreflang="eo" data-title="Taŭo (litero)" data-language-autonym="Esperanto" data-language-local-name="世界语" 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%A4" title="Τ – 西班牙语" lang="es" hreflang="es" data-title="Τ" data-language-autonym="Español" data-language-local-name="西班牙语" 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/Tau" title="Tau – 爱沙尼亚语" lang="et" hreflang="et" data-title="Tau" data-language-autonym="Eesti" data-language-local-name="爱沙尼亚语" 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/Tau_(hizkia)" title="Tau (hizkia) – 巴斯克语" lang="eu" hreflang="eu" data-title="Tau (hizkia)" data-language-autonym="Euskara" data-language-local-name="巴斯克语" 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%AA%D8%A7%D9%88" title="تاو – 波斯语" lang="fa" hreflang="fa" data-title="تاو" data-language-autonym="فارسی" data-language-local-name="波斯语" 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/Tau" title="Tau – 芬兰语" lang="fi" hreflang="fi" data-title="Tau" data-language-autonym="Suomi" data-language-local-name="芬兰语" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Tau" title="Tau – 法语" lang="fr" hreflang="fr" data-title="Tau" data-language-autonym="Français" data-language-local-name="法语" 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/T%C3%B3" title="Tó – 爱尔兰语" lang="ga" hreflang="ga" data-title="Tó" data-language-autonym="Gaeilge" data-language-local-name="爱尔兰语" 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/Tau" title="Tau – 苏格兰盖尔语" lang="gd" hreflang="gd" data-title="Tau" data-language-autonym="Gàidhlig" data-language-local-name="苏格兰盖尔语" 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/Tau" title="Tau – 加利西亚语" lang="gl" hreflang="gl" data-title="Tau" data-language-autonym="Galego" data-language-local-name="加利西亚语" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/Tau" title="Tau – 豪萨语" lang="ha" hreflang="ha" data-title="Tau" data-language-autonym="Hausa" data-language-local-name="豪萨语" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/%CE%A4" title="Τ – 客家语" lang="hak" hreflang="hak" data-title="Τ" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="客家语" 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%98%D7%90%D7%95_(%D7%90%D7%95%D7%AA)" title="טאו (אות) – 希伯来语" lang="he" hreflang="he" data-title="טאו (אות)" data-language-autonym="עברית" data-language-local-name="希伯来语" 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/Tau" title="Tau – 克罗地亚语" lang="hr" hreflang="hr" data-title="Tau" data-language-autonym="Hrvatski" data-language-local-name="克罗地亚语" 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%A4" title="Τ – 海地克里奥尔语" lang="ht" hreflang="ht" data-title="Τ" data-language-autonym="Kreyòl ayisyen" data-language-local-name="海地克里奥尔语" 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/Tau" title="Tau – 匈牙利语" lang="hu" hreflang="hu" data-title="Tau" data-language-autonym="Magyar" data-language-local-name="匈牙利语" 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/%D5%8F%D5%A1%D5%B8%D6%82_(%D5%BF%D5%A1%D5%BC)" title="Տաու (տառ) – 亚美尼亚语" lang="hy" hreflang="hy" data-title="Տաու (տառ)" data-language-autonym="Հայերեն" data-language-local-name="亚美尼亚语" 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/Tau" title="Tau – 印度尼西亚语" lang="id" hreflang="id" data-title="Tau" data-language-autonym="Bahasa Indonesia" data-language-local-name="印度尼西亚语" 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/T%C3%A1_(b%C3%B3kstafur)" title="Tá (bókstafur) – 冰岛语" lang="is" hreflang="is" data-title="Tá (bókstafur)" data-language-autonym="Íslenska" data-language-local-name="冰岛语" 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/Tau" title="Tau – 意大利语" lang="it" hreflang="it" data-title="Tau" data-language-autonym="Italiano" data-language-local-name="意大利语" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%CE%A4" title="Τ – 日语" lang="ja" hreflang="ja" data-title="Τ" data-language-autonym="日本語" data-language-local-name="日语" 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%A2%E1%83%90%E1%83%A3_(%E1%83%90%E1%83%A1%E1%83%9D)" title="ტაუ (ასო) – 格鲁吉亚语" lang="ka" hreflang="ka" data-title="ტაუ (ასო)" data-language-autonym="ქართული" data-language-local-name="格鲁吉亚语" 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%A4_(Tau)" title="Τ (Tau) – Komering" lang="kge" hreflang="kge" data-title="Τ (Tau)" 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%A4" title="Τ – 韩语" lang="ko" hreflang="ko" data-title="Τ" data-language-autonym="한국어" data-language-local-name="韩语" 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/Tau" title="Tau – 库尔德语" lang="ku" hreflang="ku" data-title="Tau" data-language-autonym="Kurdî" data-language-local-name="库尔德语" 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%A2%D0%B0%D1%83" title="Тау – 科米语" lang="kv" hreflang="kv" data-title="Тау" data-language-autonym="Коми" data-language-local-name="科米语" 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/Tau" title="Tau – 拉丁语" lang="la" hreflang="la" data-title="Tau" data-language-autonym="Latina" data-language-local-name="拉丁语" 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/Tau" title="Tau – 卢森堡语" lang="lb" hreflang="lb" data-title="Tau" data-language-autonym="Lëtzebuergesch" data-language-local-name="卢森堡语" 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%A2%D0%B0%D1%83" title="Тау – 列兹金语" lang="lez" hreflang="lez" data-title="Тау" data-language-autonym="Лезги" data-language-local-name="列兹金语" 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/Tau_(raid%C4%97)" title="Tau (raidė) – 立陶宛语" lang="lt" hreflang="lt" data-title="Tau (raidė)" data-language-autonym="Lietuvių" data-language-local-name="立陶宛语" 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/Tau_(burts)" title="Tau (burts) – 拉脱维亚语" lang="lv" hreflang="lv" data-title="Tau (burts)" data-language-autonym="Latviešu" data-language-local-name="拉脱维亚语" 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%B1%E0%B5%8D%E0%B4%B1%E0%B5%97" title="റ്റൗ – 马拉雅拉姆语" lang="ml" hreflang="ml" data-title="റ്റൗ" data-language-autonym="മലയാളം" data-language-local-name="马拉雅拉姆语" 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%9F%E0%A4%BE%E0%A4%89" title="टाउ – 马拉地语" lang="mr" hreflang="mr" data-title="टाउ" data-language-autonym="मराठी" data-language-local-name="马拉地语" 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/Tau" title="Tau – 马来语" lang="ms" hreflang="ms" data-title="Tau" data-language-autonym="Bahasa Melayu" data-language-local-name="马来语" 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%A4" title="Τ – Nahuatl" lang="nah" hreflang="nah" data-title="Τ" 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/Tau" title="Tau – 低地德语" lang="nds" hreflang="nds" data-title="Tau" data-language-autonym="Plattdüütsch" data-language-local-name="低地德语" 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/Tau_(letter)" title="Tau (letter) – 荷兰语" lang="nl" hreflang="nl" data-title="Tau (letter)" data-language-autonym="Nederlands" data-language-local-name="荷兰语" 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/Bokstaven_tau" title="Bokstaven tau – 挪威尼诺斯克语" lang="nn" hreflang="nn" data-title="Bokstaven tau" data-language-autonym="Norsk nynorsk" data-language-local-name="挪威尼诺斯克语" 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/Tau_(bokstav)" title="Tau (bokstav) – 书面挪威语" lang="nb" hreflang="nb" data-title="Tau (bokstav)" data-language-autonym="Norsk bokmål" data-language-local-name="书面挪威语" 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/Tau" title="Tau – 奥克语" lang="oc" hreflang="oc" data-title="Tau" data-language-autonym="Occitan" data-language-local-name="奥克语" 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%9F%E0%A8%BE%E0%A8%93" title="ਟਾਓ – 旁遮普语" lang="pa" hreflang="pa" data-title="ਟਾਓ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="旁遮普语" 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/Tau" title="Tau – 波兰语" lang="pl" hreflang="pl" data-title="Tau" data-language-autonym="Polski" data-language-local-name="波兰语" 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%A4" title="Τ – 葡萄牙语" lang="pt" hreflang="pt" data-title="Τ" data-language-autonym="Português" data-language-local-name="葡萄牙语" 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/Tau" title="Tau – 罗马尼亚语" lang="ro" hreflang="ro" data-title="Tau" data-language-autonym="Română" data-language-local-name="罗马尼亚语" 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%A2%D0%B0%D1%83" title="Тау – 俄语" lang="ru" hreflang="ru" data-title="Тау" data-language-autonym="Русский" data-language-local-name="俄语" 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%A4" title="Τ – 北方萨米语" lang="se" hreflang="se" data-title="Τ" data-language-autonym="Davvisámegiella" data-language-local-name="北方萨米语" 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/Tau" title="Tau – 塞尔维亚-克罗地亚语" lang="sh" hreflang="sh" data-title="Tau" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="塞尔维亚-克罗地亚语" 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/Tau" title="Tau – Simple English" lang="en-simple" hreflang="en-simple" data-title="Tau" 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/Tau" title="Tau – 斯洛伐克语" lang="sk" hreflang="sk" data-title="Tau" data-language-autonym="Slovenčina" data-language-local-name="斯洛伐克语" 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/Tau" title="Tau – 斯洛文尼亚语" lang="sl" hreflang="sl" data-title="Tau" data-language-autonym="Slovenščina" data-language-local-name="斯洛文尼亚语" 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%A2%D0%B0%D1%83_(%D1%81%D0%BB%D0%BE%D0%B2%D0%BE)" title="Тау (слово) – 塞尔维亚语" lang="sr" hreflang="sr" data-title="Тау (слово)" data-language-autonym="Српски / srpski" data-language-local-name="塞尔维亚语" 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/Tau_(bokstav)" title="Tau (bokstav) – 瑞典语" lang="sv" hreflang="sv" data-title="Tau (bokstav)" data-language-autonym="Svenska" data-language-local-name="瑞典语" 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/Tau" title="Tau – 斯瓦希里语" lang="sw" hreflang="sw" data-title="Tau" data-language-autonym="Kiswahili" data-language-local-name="斯瓦希里语" 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%B9%80%E0%B8%97%E0%B8%B2_(%E0%B8%AD%E0%B8%B1%E0%B8%81%E0%B8%A9%E0%B8%A3%E0%B8%81%E0%B8%A3%E0%B8%B5%E0%B8%81)" title="เทา (อักษรกรีก) – 泰语" lang="th" hreflang="th" data-title="เทา (อักษรกรีก)" data-language-autonym="ไทย" data-language-local-name="泰语" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl badge-Q70893996 mw-list-item" title=""><a href="https://tl.wikipedia.org/wiki/Tau" title="Tau – 他加禄语" lang="tl" hreflang="tl" data-title="Tau" data-language-autonym="Tagalog" data-language-local-name="他加禄语" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Taf" title="Taf – 土耳其语" lang="tr" hreflang="tr" data-title="Taf" data-language-autonym="Türkçe" data-language-local-name="土耳其语" 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%A2%D0%B0%D1%83_(%D0%BB%D1%96%D1%82%D0%B5%D1%80%D0%B0)" title="Тау (літера) – 乌克兰语" lang="uk" hreflang="uk" data-title="Тау (літера)" data-language-autonym="Українська" data-language-local-name="乌克兰语" 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/Tau" title="Tau – 维普森语" lang="vep" hreflang="vep" data-title="Tau" data-language-autonym="Vepsän kel’" data-language-local-name="维普森语" 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/Tau" title="Tau – 越南语" lang="vi" hreflang="vi" data-title="Tau" data-language-autonym="Tiếng Việt" data-language-local-name="越南语" 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/Tau" title="Tau – 瓦瑞语" lang="war" hreflang="war" data-title="Tau" data-language-autonym="Winaray" data-language-local-name="瓦瑞语" 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%A4" title="Τ – 吴语" lang="wuu" hreflang="wuu" data-title="Τ" data-language-autonym="吴语" data-language-local-name="吴语" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/%CE%A4" title="Τ – 闽南语" lang="nan" hreflang="nan" data-title="Τ" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="闽南语" 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%A4" title="Τ – 粤语" lang="yue" hreflang="yue" data-title="Τ" data-language-autonym="粵語" data-language-local-name="粤语" 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/Q14415#sitelinks-wikipedia" title="编辑跨语言链接" class="wbc-editpage">编辑链接</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="命名空间"> <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/%CE%A4" title="浏览条目正文[c]" accesskey="c"><span>条目</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:%CE%A4" rel="discussion" title="关于此页面的讨论[t]" accesskey="t"><span>讨论</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown " > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" 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rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r84265675"><table class="sidebar nomobile nowraplinks greek-alphabet-sidebar"><tbody><tr><td class="sidebar-top-image"><span typeof="mw:File"><a href="/wiki/File:Tau_uc_lc.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Tau_uc_lc.svg/100px-Tau_uc_lc.svg.png" decoding="async" width="100" height="67" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Tau_uc_lc.svg/150px-Tau_uc_lc.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Tau_uc_lc.svg/200px-Tau_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/%E5%B8%8C%E8%85%8A%E5%AD%97%E6%AF%8D" title="希腊字母">希腊字母</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/%CE%91" title="Α">Alpha</a></td><td> Νν</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%9D" title="Ν">Nu</a></td></tr><tr style="vertical-align:top"><td> Ββ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%92" title="Β">Beta</a></td><td> Ξξ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%9E" title="Ξ">Xi</a></td></tr><tr style="vertical-align:top"><td> Γγ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%93" title="Γ">Gamma</a></td><td> Οο</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%9F" title="Ο">Omicron</a></td></tr><tr style="vertical-align:top"><td> Δδ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%94" title="Δ">Delta</a></td><td> Ππ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A0" title="Π">Pi</a></td></tr><tr style="vertical-align:top"><td> Εε</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%95" title="Ε">Epsilon</a></td><td> Ρρ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A1" title="Ρ">Rho</a></td></tr><tr style="vertical-align:top"><td> Ζζ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%96" title="Ζ">Zeta</a></td><td> Σσς</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A3" title="Σ">Sigma</a></td></tr><tr style="vertical-align:top"><td> Ηη</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%97" title="Η">Eta</a></td><td> Ττ</td><td style="padding-right:0.6em;"> <a class="mw-selflink selflink">Tau</a></td></tr><tr style="vertical-align:top"><td> Θθ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%98" title="Θ">Theta</a></td><td> Υυ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A5" title="Υ">Upsilon</a></td></tr><tr style="vertical-align:top"><td> Ιι</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%99" title="Ι">Iota</a></td><td> Φφ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A6" title="Φ">Phi</a></td></tr><tr style="vertical-align:top"><td> Κκ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%9A" title="Κ">Kappa</a></td><td> Χχ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A7" title="Χ">Chi</a></td></tr><tr style="vertical-align:top"><td> Λλ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%9B" title="Λ">Lambda</a></td><td> Ψψ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A8" title="Ψ">Psi</a></td></tr><tr style="vertical-align:top"><td> Μμ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CE%9C" title="Μ">Mu</a></td><td> Ωω</td><td style="padding-right:0.6em;"> <a href="/wiki/%CE%A9" title="Ω">Omega</a></td></tr></tbody></table></td> </tr><tr><th class="sidebar-heading"> <span class="ilh-all" data-orig-title="希腊字母历史" data-lang-code="en" data-lang-name="英语" data-foreign-title="History of the Greek alphabet"><span class="ilh-page"><a href="/w/index.php?title=%E5%B8%8C%E8%85%8A%E5%AD%97%E6%AF%8D%E5%8E%86%E5%8F%B2&action=edit&redlink=1" class="new" title="希腊字母历史（页面不存在）">历史</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/History_of_the_Greek_alphabet" class="extiw" title="en:History of the Greek alphabet"><span lang="en" dir="auto">History of the Greek alphabet</span></a></span>）</span></span></th></tr><tr><td class="sidebar-content hlist"> <div style="padding:0.2em 0.4em; line-height:1.2em; line-height:1.1em;padding-bottom:0.45em;"> <a href="/wiki/%E5%8F%A4%E5%B8%8C%E8%85%8A%E5%AD%97%E6%AF%8D" title="古希腊字母"><b>古希腊字母变体</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/%CF%9C" title="Ϝ">Digamma</a></td><td> Ͱ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CD%B0" title="Ͱ">Heta</a></td></tr><tr style="vertical-align:top"><td> Ϻ</td><td style="padding-right:1.0em;"> <a href="/wiki/%CF%BA" title="Ϻ">San</a></td><td> Ϙ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CF%98" title="Ϙ">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/%CF%BA" title="Ϻ">Tsan</a></li><li><a href="/wiki/%CF%9C" title="Ϝ">Digamma</a></li></ul></div></td><td> Ͳ</td><td style="padding-right:0.6em;"> <a href="/wiki/%CD%B2" title="Ͳ">Sampi</a></td></tr></tbody></table></td> </tr><tr><th class="sidebar-heading"> 变音符号和其他符号</th></tr><tr><td class="sidebar-content hlist"> <div style="padding:0.2em 0.4em; line-height:1.2em; padding-top:0.3em;line-height:1.1em;padding-bottom:0;"><a href="/wiki/%E5%B8%8C%E8%87%98%E8%AA%9E%E8%AE%8A%E9%9F%B3%E7%AC%A6%E8%99%9F" title="希臘語變音符號">变音符号</a></div> <div class="hlist"><ul><li><a href="/wiki/%E5%B0%96%E9%9F%B3%E7%AC%A6" title="尖音符">ά</a></li><li><a href="/wiki/%E9%87%8D%E9%9F%B3%E7%AC%A6" title="重音符">ὰ</a></li><li><a href="/wiki/%E6%8F%9A%E6%8A%91%E7%AC%A6" title="揚抑符">ᾶ</a></li><li><span class="ilh-all" data-orig-title="细气符" data-lang-code="en" data-lang-name="英语" data-foreign-title="Smooth breathing"><span class="ilh-page"><a href="/w/index.php?title=%E7%BB%86%E6%B0%94%E7%AC%A6&action=edit&redlink=1" class="new" title="细气符（页面不存在）">ἀ</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/Smooth_breathing" class="extiw" title="en:Smooth breathing"><span lang="en" dir="auto">Smooth breathing</span></a></span>）</span></span></li><li><a href="/wiki/%E7%B2%97%E6%B0%94%E7%AC%A6" title="粗气符">ἁ</a></li><li><a href="/wiki/%E9%95%B7%E9%9F%B3%E7%AC%A6%E8%99%9F" title="長音符號">ᾱ</a></li><li><a href="/wiki/%E7%9F%AD%E9%9F%B3%E7%AC%A6" title="短音符">ᾰ</a></li><li><a href="/wiki/%E5%88%86%E9%9F%B3%E7%AC%A6" title="分音符">ϊ</a></li><li><span class="ilh-all" data-orig-title="Iota下标" data-lang-code="en" data-lang-name="英语" data-foreign-title="Iota subscript"><span class="ilh-page"><a href="/w/index.php?title=Iota%E4%B8%8B%E6%A0%87&action=edit&redlink=1" class="new" title="Iota下标（页面不存在）">ᾳ</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/Iota_subscript" class="extiw" title="en:Iota subscript"><span lang="en" dir="auto">Iota subscript</span></a></span>）</span></span></li><li><a href="/wiki/%E6%8A%91%E6%89%AC%E7%AC%A6" title="抑扬符">σ̌</a></li></ul></div> <div style="padding:0.2em 0.4em; line-height:1.2em; padding-top:0.3em;line-height:1.1em;padding-bottom:0;"><span class="ilh-all" data-orig-title="希腊语连字" data-lang-code="en" data-lang-name="英语" data-foreign-title="Greek ligatures"><span class="ilh-page"><a href="/w/index.php?title=%E5%B8%8C%E8%85%8A%E8%AF%AD%E8%BF%9E%E5%AD%97&action=edit&redlink=1" class="new" title="希腊语连字（页面不存在）">连字</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/Greek_ligatures" class="extiw" title="en:Greek ligatures"><span lang="en" dir="auto">Greek ligatures</span></a></span>）</span></span></div> <div class="hlist"><ul><li style="font-size:110%;"><span class="ilh-all" data-orig-title="Ϗ" data-lang-code="en" data-lang-name="英语" data-foreign-title="Kai (conjunction)"><span class="ilh-page"><a href="/w/index.php?title=%CF%8F&action=edit&redlink=1" class="new" title="Ϗ（页面不存在）">ϗ</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/Kai_(conjunction)" class="extiw" title="en:Kai (conjunction)"><span lang="en" dir="auto">Kai (conjunction)</span></a></span>）</span></span></li><li style="font-size:110%;"><a href="/wiki/%CF%9A" title="Ϛ">ϛ</a></li></ul></div> <div style="padding:0.2em 0.4em; line-height:1.2em; padding-top:0.3em;line-height:1.1em;padding-bottom:0;"> <a href="/wiki/%E5%B8%8C%E8%85%8A%E6%95%B0%E5%AD%97" title="希腊数字">数字</a></div> <div class="hlist"><ul><li style="font-size:110%;"><a href="/wiki/%CF%9C" title="Ϝ">ϛ<small>（6）</small></a></li><li style="font-size:110%;"><a href="/wiki/%CF%98" title="Ϙ">ϟ<small>（90）</small></a></li><li style="font-size:110%;"><a href="/wiki/%CD%B2" title="Ͳ">ϡ<small>（900）</small></a></li></ul></div></td> </tr><tr><th class="sidebar-heading"> 在其他语言中的应用</th></tr><tr><td class="sidebar-content hlist"> <ul><li><a href="/wiki/%E5%B7%B4%E5%85%8B%E7%89%B9%E9%87%8C%E4%BA%9A%E8%AF%AD" title="巴克特里亚语">巴克特里亚语</a></li> <li><a href="/wiki/%E7%A7%91%E6%99%AE%E7%89%B9%E5%AD%97%E6%AF%8D" title="科普特字母">科普特语</a></li> <li><span class="ilh-all" data-orig-title="阿尔巴尼亚语字母" data-lang-code="en" data-lang-name="英语" data-foreign-title="Albanian alphabet"><span class="ilh-page"><a href="/w/index.php?title=%E9%98%BF%E5%B0%94%E5%B7%B4%E5%B0%BC%E4%BA%9A%E8%AF%AD%E5%AD%97%E6%AF%8D&action=edit&redlink=1" class="new" title="阿尔巴尼亚语字母（页面不存在）">阿尔巴尼亚语</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/Albanian_alphabet" class="extiw" title="en:Albanian alphabet"><span lang="en" dir="auto">Albanian alphabet</span></a></span>）</span></span></li> <li><a href="/wiki/%E5%8F%A4%E6%84%8F%E5%A4%A7%E5%88%A9%E5%AD%97%E6%AF%8D" title="古意大利字母">古意大利语</a></li></ul></td> </tr><tr><th class="sidebar-heading"> 相关主题</th></tr><tr><td class="sidebar-content hlist"> <ul><li><a href="/wiki/%E7%94%A8%E6%96%BC%E6%95%B8%E5%AD%B8%E3%80%81%E7%A7%91%E5%AD%B8%E5%92%8C%E5%B7%A5%E7%A8%8B%E7%9A%84%E5%B8%8C%E8%87%98%E5%AD%97%E6%AF%8D" title="用於數學、科學和工程的希臘字母">用作科学符号</a></li></ul></td> </tr><tr><td class="sidebar-below plainlist"> <div class="hlist"> <ul><li><span typeof="mw:File"><span title="分类"><img alt="分类" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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:%E5%B8%8C%E8%85%8A%E5%AD%97%E6%AF%8D" title="Category:希腊字母">分类</a></li></ul> </div></td></tr><tr><td class="sidebar-navbar" style="line-height:1.6"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r84265675"><style data-mw-deduplicate="TemplateStyles:r84244141">.mw-parser-output .navbar{display:inline;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:110%;margin:0 8em}.mw-parser-output .navbar-ct-mini{font-size:110%;margin:0 5em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Greek_alphabet_sidebar" title="Template:Greek alphabet sidebar"><abbr title="查看该模板">查</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Greek_alphabet_sidebar" title="Template talk:Greek alphabet sidebar"><abbr title="讨论该模板">论</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:%E7%BC%96%E8%BE%91%E9%A1%B5%E9%9D%A2/Template:Greek_alphabet_sidebar" title="Special:编辑页面/Template:Greek alphabet sidebar"><abbr title="编辑该模板">编</abbr></a></li></ul></div></td></tr></tbody></table> <p><b>Tau</b>（大写<span lang="el">Τ</span>，小写<span lang="el">τ</span>，，中文音译：<b>陶</b><sup id="cite_ref-termcn_1-0" class="reference"><a href="#cite_note-termcn-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>、套），是第十九个<a href="/wiki/%E5%B8%8C%E8%85%8A%E5%AD%97%E6%AF%8D" title="希腊字母">希腊字母</a>。 </p><p>小写τ用于： </p> <ul><li><a href="/wiki/%E7%89%A9%E7%90%86" class="mw-redirect" title="物理">力學</a>上的<a href="/wiki/%E5%8A%9B%E7%9F%A9" title="力矩">力矩</a></li> <li><a href="/wiki/%E9%80%8F%E6%98%8E%E5%BA%A6" class="mw-disambig" title="透明度">透明度</a></li> <li><a href="/wiki/%E7%B2%92%E5%AD%90%E7%89%A9%E7%90%86%E5%AD%A6" class="mw-redirect" title="粒子物理学">粒子物理学</a>上的<a href="/wiki/%CE%A4%E5%AD%90" title="Τ子">陶子</a>（<a href="/wiki/%E8%BD%BB%E5%AD%90" class="mw-redirect" title="轻子">轻子</a>的一种）</li> <li><a href="/wiki/%E5%BE%AE%E7%A9%8D%E5%88%86" class="mw-redirect" title="微積分">微積分</a>中的<a href="/wiki/%E9%AB%94%E7%A9%8D" class="mw-redirect" title="體積">體積</a><a href="/wiki/%E7%A9%8D%E5%88%86" class="mw-redirect" title="積分">積分</a>元（有時）</li></ul> <p><a href="/wiki/%E8%A5%BF%E9%87%8C%E5%B0%94%E5%AD%97%E6%AF%8D" title="西里尔字母">西里尔字母</a>的<a href="/wiki/%D0%A2" title="Т">Т</a>及<a href="/wiki/%E6%8B%89%E4%B8%81%E5%AD%97%E6%AF%8D" title="拉丁字母">拉丁字母</a>的<a href="/wiki/T" title="T">T</a>都是由Tau演变而成。 </p> <div class="mw-heading mw-heading2"><h2 id="用作双倍π"><span id=".E7.94.A8.E4.BD.9C.E5.8F.8C.E5.80.8D.CF.80"></span>用作双倍π</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%CE%A4&action=edit&section=1" title="编辑章节：用作双倍π"><span>编辑</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>近年来，有部分学者认为约等于3.14的π“不合自然”，应该用双倍于π、约等于6.28的一个常数代替。支持这一说法的学者认为在很多数学公式2π很常见，很少单独使用一个π。<a href="/wiki/%E7%BE%8E%E5%9B%BD" title="美国">美国</a><a href="/wiki/%E5%93%88%E4%BD%9B%E5%A4%A7%E5%AD%A6" title="哈佛大学">哈佛大学</a>物理学教授的<a href="/w/index.php?title=%E8%BF%88%E5%85%8B%E5%B0%94%C2%B7%E5%93%88%E7%89%B9%E5%B0%94&action=edit&redlink=1" class="new" title="迈克尔·哈特尔（页面不存在）">迈克尔·哈特尔</a>（Michael Hartl）称“圆形与直径无关，而与半径相关，圆形由离中心一定距离即半径的一系列点构成”。并建议使用希腊字母<b>τ</b>来代替π。<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><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><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><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>美国数学家麦克·哈特尔（Michael Hartl）建立了网站 Tau Day，呼吁人们用希腊字母 τ（发音：tau）来表示“正确的”圆周率 C/r。并建议大家以后在写论文时，用一句“为方便起见，定义 τ = 2π ”开头。<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><p>美国数学家鲍勃·帕莱（Bob Palais）于2001年在《数学情报》（Mathematical Intelligencer）上发表了一篇题为《π 是错误的！》（π Is Wrong!）的论文。在论文的第一段，鲍勃·帕莱说道：<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> <style data-mw-deduplicate="TemplateStyles:r61209892">.mw-parser-output .templatequote{margin-top:0;overflow:hidden}.mw-parser-output .templatequote .templatequotecite{line-height:1em;text-align:left;padding-left:2em;margin-top:0}.mw-parser-output .templatequote .templatequotecite cite{font-size:small}</style> </p> <blockquote class="templatequote"><p>几个世纪以来，π 受到了无限的推崇和赞赏。数学家们歌颂 π 的伟大与神秘，把它当作数学界的象征；计算器和编程语言里也少不了 π 的身影；甚至有一部电影就直接以它命名⋯⋯但是，π 其实只是一个冒牌货，真正值得大家敬畏和赞赏的，其实应该是一个不幸被我们称作 2π 的数。</p></blockquote> <p>著名的Geek漫畫網站spikedmath.com建立了 <a rel="nofollow" class="external text" href="https://thepimanifesto.com">thepimanifesto.com</a> （<a rel="nofollow" class="external text" href="//web.archive.org/web/20200924105732/https://thepimanifesto.com/">页面存档备份</a>，存于<a href="/wiki/%E4%BA%92%E8%81%94%E7%BD%91%E6%A1%A3%E6%A1%88%E9%A6%86" title="互联网档案馆">互联网档案馆</a>），裡面有一篇數千字的《π宣言》，反駁支持τ的言論，宣稱圓周率定義為圓周與直徑之比有優越性，並認為在衡量圓柱形物體的截面大小時，直徑比半徑更方便測量。 </p> <div class="mw-heading mw-heading2"><h2 id="參考"><span id=".E5.8F.83.E8.80.83"></span>參考</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%CE%A4&action=edit&section=2" title="编辑章节：參考"><span>编辑</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <ol class="references"> <li id="cite_note-termcn-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-termcn_1-0">^</a></b></span> <span class="reference-text"><cite class="citation journal"><a rel="nofollow" class="external text" href="http://www.term.org.cn/CN/abstract/abstract11339.shtml">希腊字母的汉字规范译音</a>. 中国科技术语. 2003, <b>5</b> (03) <span class="reference-accessdate"> [<span class="nowrap">2021-11-30</span>]</span>. <a rel="nofollow" class="external text" href="//www.worldcat.org/issn/1673-8578"><span title="国际标准连续出版物号">ISSN 1673-8578</span></a>. （原始内容<a rel="nofollow" class="external text" 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