Crossword Genius

Inflation indication: Abbr (3)

Ross

I believe the answer is:

psi

(Other definitions for psi that I've seen before include "Pounds per square inch (abbr.); Greek letter" , "Pounds per sq. in. (abbr.)" , "letter from abroad" , "Greek character" , "foreign letter" .)

I've seen this clue in the Newsday.com and the Newsday.
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