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The pound per square inch (abbreviation: psi) or, more accurately, pound-force per square inch (symbol: lbf/in2), [1] is a unit of measurement of pressure or of stress based on avoirdupois …

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PSI meaning: 1. the 23rd letter of the Greek alphabet 2. abbreviation for pounds per square inch, used when…. Learn more.

Pounds or pound force per square inch (psi, lb/in², pfsi or lbf/in²) is a widely used British and American unit of measure for pressure.

Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet Psi (Cyrillic), letter of the early Cyrillic alphabet, adopted from Greek

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