Crossword Genius

Time constant symbol (3)

Ross

I believe the answer is:

tau

'time constant symbol' 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" , "Marathon character" , "Homeric character" , "character from Athens" , "19th letter of the Greek alphabet" .)

I've seen this clue in The New York Times.
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