Trident-shaped Greek letters

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Possible Answers:

PSIS.

Last seen on: USA Today Crossword – May 17 2021

Random information on the term “PSIS”:

The posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior inferior iliac spine. The posterior superior iliac spine serves for the attachment of the oblique portion of the posterior sacroiliac ligaments and the multifidus.

This article incorporates text in the public domain from page 234 of the 20th edition of Gray’s Anatomy (1918)

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PSIS on Wikipedia