Crossword Genius

Greek letter (5)

Ross

'greek letter' is the definition.
(letter from the Greek alphabet)

This is all the clue.

(Other definitions for sigma that I've seen before include "Greek letter used as a symbol for summation" , "character in Corfu" , "How Socrates ended" , "Greek letter corresponding to S" , "Foreign character" .)

I've seen this clue in The Guardian, the King Feature Syndicate, The Star Tribune, The Mirror, The Independent, the Sydney Morning Herald, the Evening Standard, the Penny Press, The Times and The Telegraph.
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