Crossword Genius

Trident-shaped Greek letters (4)

Ross

I believe the answer is:

psis

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">trident-shaped greek letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for psis that I've seen before include "letters from abroad" , "letters from Greece" .)

I've seen this clue in The New York Times, the L.A. Times Daily, the Universal, the Newsday.com and the USA Today.
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