Crossword Genius

Plane angle symbol (5)

Ross

I believe the answer is:

theta

'plane angle symbol' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for theta that I've seen before include "letter from Argos?" , "8th letter of the Greek alphabet" , "character from Greece" , "letter to Greeks" , "Foreign letter" .)

I've seen this clue in The Washington Post and the L.A. Times Daily.
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