Sigma (Greek letter)
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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.
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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.