File:Sigma_uc_lc.svg · Wikimedia Commons · See Wikimedia Commons
Sigma (Σ) is the eighteenth letter of the Greek alphabet with two lowercase forms: σ is used in the middle of words, while ς is used at the end of words. This distinction between middle and final forms is unique to sigma among Greek letters and appears in words like "Odysseus," where the two middle sigmas differ visually from the final sigma.
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Wikidata facts
- Part of
- Greek alphabet
- Followed by
- Τ
- Follows
- Ρ
- Image
- Sigma uc lc.svg
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- Commons category
- Sigma (letter)
- Unicode character
- ς
- replaces
- lunate sigma
- Commons gallery
- Σ
- different from
- esh
- maintained by WikiProject
- WikiProject Mathematics
- language of work or name
- Greek
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Article · 中文
Sigma(大写Σ,小写σ,中文音译:西格马),是第十八个希腊字母。在現代的希臘數字代表200。 在希腊语中,若一个单字的最末一个字母是小写sigma,要把该字母写成 ς,此字母又称final sigma(Unicode: U+03C2 (页面存档备份,存于互联网档案馆))。 大写Σ可以表示: * 数学上的求和符号(又称和式号)。 * 粒子物理学中的一类重子(Σ重子)。 小写σ可以表示: * σ键,化學上一类原子轨道“头碰头”形成的化学键。 * 统计学上的标准差。 * 除数函数。 * σ-代数。 * RNA聚合酶的σ因子。 * 恆星光度的 斯特藩-玻尔兹曼常数。 * 应力。 西里尔字母的С及拉丁字母的S都源于Sigma,而西里尔字母С的直接起源是Sigma的一个弯月形变体Ϲ。
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