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Sigma

HistoryArchaic local variants Diacritics and other symbolsDiacriticsάὰᾶἀἁᾱᾰϊᾳσ̌LigaturesϗϛNumerals (Attic)ϛ (6)ϟ (90)ϡ (900) Related topicsUse as scientific symbolsOrthographyRomanizationCyrillizationSigma ( ; uppercaseΣ, lowercaseσ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet.

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