Crossword Genius

Three-point letter you won't find in Scrabble? (3)

Ross

I believe the answer is:

psi

(Other definitions for psi that I've seen before include "Pounds per sq. in. (abbr.)" , "letter from abroad" , "Greek letter; pressure unit" , "foreign letter" , "one employed by Socrates?" .)

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