Crossword Genius

Trident-shaped letter (3)

Ross

I believe the answer is:

psi

'trident-shaped letter' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the Newsday, the USA Today, the LA Times and The Wall Street Journal.
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