Trident-shaped letter

This time we are looking on the crossword clue for: Trident-shaped letter.
it’s A 21 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: PSI.

Last seen on: –Wall Street Journal Crossword – May 27 2022 – Dirty Pool
Wall Street Journal Crossword – May 04 2022 – Double Play
Wall Street Journal Crossword – May 04 2022 – Double Play
LA Times Crossword 18 Apr 21, Sunday
NY Times Crossword 3 Sep 20, Thursday

Random information on the term “PSI”:

Psi (uppercase Ψ, lowercase ψ; Greek: Ψι Psi) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word “lapse”).

For Greek loanwords in Latin and modern languages with Latin alphabets, psi is usually transliterated as “ps”. In English, the letter is pronounced /ˈsaɪ/ or sometimes /ˈpsaɪ/. (In Greek, it is pronounced [ˈpsi].)

The letter’s origin is uncertain. It may or may not derive from the Phoenician alphabet. It appears in the 7th century BC, expressing /ps/ in the Eastern alphabets, but /kʰ/ in the Western alphabets (the sound expressed by Χ in the Eastern alphabets). In writing, the early letter appears in an angular shape (). There were early graphical variants that omitted the stem (“chickenfoot-shaped psi” as: or ).

The Western letter (expressing /kʰ/, later /x/) was adopted into the Old Italic alphabets, and its shape is also continued into the Algiz rune of the Elder Futhark. The classical Greek letter was adopted into the early Cyrillic alphabet as “Ѱ”.

PSI on Wikipedia