Crossword Genius

Letter before upsilon (3)

Ross

I believe the answer is:

tau

'letter before upsilon' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tau that I've seen before include "Greek character" , "Homeric character" , "Letter from Greece" , "19th letter of the Greek alphabet" , "Marathon character" .)

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