Crossword Genius

Greek letter S (5)

Ross

I believe the answer is:

sigma

'greek letter s' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for sigma that I've seen before include "Greek letter corresponding to S" , "Athenian character" , "Greek letter signifying sum in maths" , "How Socrates ended" , "Greek letter indicating summation in maths" .)

I've seen this clue in The Guardian, The Times and the USA Today.
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