THX: Has been dubbed Theatrical eXtensions on numerous occations, although it's certain that the name originates in the film THX 1138, by George Lucas, Mr. Starwars.

The THX sound system was concieved in 1982, and the first THX show room is opened at Lucasfilm. A year later, in 1983, the THX division of Lucasfilm is opened. In 1990 the THX Home Sound System standard is created. In 1994, they made laserdisc THX certification, for film-production. Then in 1995, the 5.1 program was launched, and in 1998 the THX certificate for DVD (oh joy!) was launched.

Little known factoid:
The worlds biggest THX theatre is the Colosseum located in Oslo, Norway, that I've visited a whole lot. In fact, it's the only theatre I ever go to. Everything else sucks in comparison. (well, atleast some)