Crossword Genius

Greek "T" (3)

Ross

I believe the answer is:

tau

'greek t' 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 "A subatomic particle" , "letter from foreigner" , "19th letter of the Greek alphabet" , "Foreign character" , "character from Athens" .)

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