- An abbreviation of Parsec, 1 Parsec = 3.2615 Light Years
- Abbreviation of Printed Circuit Board.
- Abbreviation of Pound per Cubic Foot.
- Abbreviation of Peripheral Component Interconnect.
- Coding where the input signal is represented by a given number of
fixed-width samples per second.
- Abbreviation of Personal Computer Memory Card International Association.
- PCT Theorem
- The proposition that all the laws of physics are unchanged by the combined operations of charge conjugation (C), space inversion (P), and time reversal (T).