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 Telegraph, The Times, The Mirror, the Penny Press, the Evening Standard, The Independent, the Sydney Morning Herald, The Star Tribune and The Washington Post.
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