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 USA Today, the King Feature Syndicate, The New York Times, the LA Times, The Wall Street Journal and the Universal.
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