Here's some abbreviations off the top of my head:
AP = annual pass
IOA = Islands of Adventure
USF = Universal Studios Florida
CW = Citywalk
RPH = Royal Pacific Hotel
PBH = Portifino Bay Hotel
HRH = Hard Rock Hotel
BTTF = Back to the Future, the Ride
MIB = Men in Black: Alien Attack
JPRA = Jurassic Park River Adventure
CITH = Cat in the Hat (I don't see this used too often)
MSHI = Marvel Super Hero Island
T2 = Terminator 2: 3D
WDW = Rat World, er, Walt Disney World
That's all for now.