Sigma (Greek letter)
From Citizendium, the Citizens' Compendium
Sigma is the 18th letter of the Greek alphabet. It is written as
(upper-case) and
(lower-case), except at the end of a word, where the lower-case form is ς instead.
Sigma is the 18th letter of the Greek alphabet. It is written as
(upper-case) and
(lower-case), except at the end of a word, where the lower-case form is ς instead.