Abbreviations

EU = Entropia Universe
PE = Project Entropia
PED = Project Entropia Dollar,  ingame money (aprox. 10 ped = $1 depending on fees)
PEC = Project Entropia Cent
TT = Trade Terminal (used to buy ammo and general supplies. To "TT something" is to sell it back at its base cost to the trade terminal.)
MU = Markup
Soc = Society
PCF = Planet Calypso Forums

NPC = Non-Player Character (show up as orange dots on radar)
(L) = Limited item (can't repair, but generally more efficent)
UL = Unlimited item (repairable at a Repair Terminal)
TP = Teleporter (blue dots on your map, once you find them you can use them)
Mob = animals, robots, and mutants
Swunting = Sweat first till it attacks, then kill (most efficient form of hunting)
SIB = Skill Increase Bonus (found on the second tab of the items info, extremely important)
BP = Blue Print
FAP = Healing Tool