My couple of cents:
- 'DE' is also occasionally used to refer (erroneously, in my opinion) to the DC. I guess as in 'Definitive Edition'. Which doesn't really exist, but that doesn't seem to stop everybody.
- LFL - Lucasfilm Ltd.
- I've seen 'LM' used to refer to Laserman.
- 'NTSC-J' is the NTSC variant used in Japan, which features no pedestal (i.e. the allowable black signal in NTSC is IRE 7.5, but NTSC-J it's IRE 0.)
- THX releases - PAL versions of the films released in 1995. Analogous to the NTSC 'Faces' releases.