PC in IT Glossary

(1) Short for personal computer or IBM PC. The first personal computer
produced by IBM was called the PC, and increasingly the term PC came
to mean IBM or IBM-compatible personal computers, to the exclusion of
other types of personal computers, such as Macintoshes.
In recent years, the term PC has become more and more difficult
to pin down. In general, though, it applies to any personal computer
based on an Intel microprocessor, or on an Intel-compatible
microprocessor. For nearly every other component, including
the operating system, there are several options, all of which
fall under the rubric of PC

(2) PC can stand for printed circuit, so a PC board is a printed
circuit board.