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 Telegraph, the Penny Press, the Sydney Morning Herald, The Mirror, The Star Tribune, The Times, the Evening Standard, the King Feature Syndicate, The Independent and The Guardian.
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