Crossword Genius

Tire pressure fig (3)

Ross

I believe the answer is:

psi

(Other definitions for psi that I've seen before include "letter from abroad" , "Pounds per square inch (abbr.); Greek letter" , "foreign letter" , "Greek letter; pounds per square inch (abbrev.)" , "Greek letter; pressure unit" .)

I've seen this clue in the Newsday, The Washington Post and the LA Times.
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