Site acronyms common to the Xterra world:
4WD = 4 Wheel Drive
4x4 = four by four (same as above)
5MT = 5 speed manual transmission
6MT = 6 speed manual transmission
4AT = 4 speed automatic transmission
ABS = AntiLock Brake System
AAL = Add A Leaf
A/C = Air Conditioning
ASE = Automotive Service...