OSL - Object source lighting.
Always thinking 2 projects ahead of anything I've yet to finish
http://instinctuimperator.blogspot.co.uk/
Updated to include:
Wraithguard
Wraithblade
Wraithknight
Object Source Lighting
Non-metallic metals
Fan of Fuggles | Derailment of the Wolfpack of Horsemen | In girum imus nocte et consumimur igni
I noticed a missing one
TH
Tread Head (def-A lover of tanks)
USR - Universal Special Rule. TBH you don't see that so often these days.
GG - Gaun't Ghosts, a famous Imperial Guard regiment
http://www.lounge.belloflostsouls.net/showthread.php?52423-The-Blood-Pact-Chaos-Homebrew-Supplement&p=472214&viewfull=1#post472214
If everyone has them, then they aren't very special more like. Universal Rules, aka Rules.
Fan of Fuggles | Derailment of the Wolfpack of Horsemen | In girum imus nocte et consumimur igni