People's Liberation Army, the official name of China's millitary. This includes not only the ground forces but also the navy and air force; hence, you'll sometimes see the seemingly contradictory terms PLA Navy and PLA Air Force (also known as the PLAAF).

Abbreviation for Programmable Logic Array, a reconfigurable electronic circuit.

Abbreviation for Phone Losers of America. PLA was an underground zine that came out in late 1994 that dealt with phone phreaking, a bit of computer hacking, and getting stuff for free. PLA was the very first zine I read, and I enjoyed it so much it inspired me to look for other zines online. It is not published anymore.