Enter a clue or pattern or both:
The Clue
Greek letters that resemble pitchforks (4 letter answer)
The Answer
PSIS
Tags
Notes
The answer PSIS is seen frequently, appearing about once every 170 puzzles.
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They're painted on some frat houses
Definition
PSI as a noun:
1. (pounds per square inch, psi) = a unit of pressure
2. the 23rd letter of the Greek alphabet