Crossword Genius

Inflation fig (3)

Ross

I believe the answer is:

psi

(Other definitions for psi that I've seen before include "Greek character" , "Greek letter; pounds per square inch (abbrev.)" , "letter from abroad" , "Twenty-third letter of Greek alphabet" , "Pounds per sq. in. (abbr.)" .)

I've seen this clue in the LA Times, the L.A. Times Daily and the New York Times.
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