Crossword Genius

Pressure meas (3)

Ross

I believe the answer is:

psi

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

I've seen this clue in the LA Times, the Newsday, the Canadiana, the Newsday.com, the L.A. Times Daily, The New York Times and The Washington Post.
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