Crossword Genius

Letter after theta (4)

Ross

I believe the answer is:

iota

'letter after theta' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for iota that I've seen before include "Greek letter; tiny amount" , "Ninth letter of Greek alphabet, small amount" , "Gr. letter; small amount" , "letter from Greece" , "Tiniest scrap" .)

I've seen this clue in the Newsday, The Wall Street Journal and The New York Times.
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