Crossword Genius

Letter after sigma (3)

Ross

I believe the answer is:

'letter after sigma' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tau that I've seen before include "Greek letter; cross" , "Foreign character" , "character from Athens" , "Homeric character" , "Letter from Greece" .)

I've seen this clue in the LA Times, the USA Today, The Wall Street Journal, The New York Times, the Universal and the King Feature Syndicate.
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