PC

PC can mean:

Personal Computer
The term personal as opposed to the large mainframe computers universities were running at that time.

The Commodore 64 was the best-selling personal computer of all times.

PC History -Pre-IBM PC's

1981 The IBM PC - Home Computer	From an "Acorn" grows a personal computer revolution

The history of computers

Nowadays PC is usually just referring to the i386 / i686 class of IBM-clone computers.

Political Correctness
.:"The most common usage for the term is to describe the alteration of language so as to not be objectionable, especially in terms of avoiding offense based on race, gender, disability, or any other protected group."

Political_correctness

Members of specific groups and people not of these groups use words, labels, and names to identify themselves and other groups. Which names are acceptable? In the 1990s political correct language has become the fashion. Read this article in The Economist for how silly the discussion has become.

U.S. Racial Groups: General & Specific Terms

Also see Gay Nigger Association of America.

Polycarbonates
group of clear, thermoplastic polymers used mainly as molding compounds (see plastic ). Polycarbonates are prepared by the reaction of an aromatic difunctional phenol with either phosgene or an aromatic or aliphatic carbonate.

Polycarbonates on encyclopedia.com