Crossword Genius

Omega ___ Phi (3)

Ross

I believe the answer is:

psi

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

I've seen this clue in the USA Today.
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