1) After chis 2) Athenian consonants 3) Characters in a frat house 4) Chi chasers 5) Corinthian consonants 6) Electric flux symbols 7) Fork-shaped frat letters 8) Fork-shaped Greek letters 9) Frat letters 10) Fraternity characters 11) Fraternity letters 12) Greek consonants 13) Greek letters 14) Greek penultimates 
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Type: Abbreviation Definitions: 1. Abbreviation for posterior superior iliac spine.
Pounds per square inch standard. Pressure referenced to a standard atmosphere.