Crossword Genius

Greek X (3)

Ross

I believe the answer is:

chi

'greek x' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for chi that I've seen before include "Twenty-second Greek letter" , "Classical symbol" , "Mental projection" , "character from Euripides?" , "T'ai -, martial art" .)

I've seen this clue in The Wall Street Journal, the LA Times, the Universal and the King Feature Syndicate.
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