Pc

pc
An abbreviation of Parsec, 1 Parsec = 3.2615 Light Years
PCB
Abbreviation of Printed Circuit Board.
pcf
Abbreviation of Pound per Cubic Foot.
PCI
Abbreviation of Peripheral Component Interconnect.
PCM
Coding where the input signal is represented by a given number of fixed-width samples per second.
PCMCIA
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).