Crossword Genius

No. listed on the inside of car doors, often (3)

Ross

I believe the answer is:

psi

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

I've seen this clue in The New York Times.
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