Crossword Genius

Greek letter (3)

Ross

'greek letter' is the definition.
(letter from the Greek alphabet)

This is the entire clue.

(Other definitions for psi that I've seen before include "Pounds per sq. in. (abbr.)" , "foreign letter" , "Greek letter; pressure unit" , "letter from abroad" , "one employed by Socrates?" .)

I've seen this clue in The Washington Post, the Penny Press, The Telegraph, the King Feature Syndicate, The Independent, The Star Tribune, the Sydney Morning Herald, The Mirror, The Times and the Evening Standard.
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