Crossword Genius

Greek letter between rho and tau (5)

Ross

I believe the answer is:

sigma

(Other definitions for sigma that I've seen before include "character in Athens" , "Gr. letter; rhymes with mark of disgrace" , "Greek character" , "Greek letter corresponding to S" , "How Socrates ended" .)

I've seen this clue in the LA Times, The Sunday Times and The Times.
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