Crossword Genius

Tire inflation abbr (3)

Ross

I believe the answer is:

psi

(Other definitions for psi that I've seen before include "Greek letter; pounds per square inch (abbrev.)" , "one employed by Socrates?" , "letter from abroad" , "Pounds per square inch (abbr.); Greek letter" , "Greek character" .)

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