Crossword Genius

Greek letter (5)

Ross

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

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