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