Crossword Genius

Golden ratio symbol (3)

Ross

I believe the answer is:

phi

'golden ratio symbol' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for phi that I've seen before include "Letter from abroad" , "exotic character" , "Greek letter; sounds like expression of outrage" , "Greek character" , "classic character" .)

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