Before starting the game, it would be wise to familiarize yourself with this list of commonly used lingo in WW2OL. Without this knowledge it can be very difficult to decode chat:
EI-Enemy Infantry
EA-Enemy Air
ET-Enemy Tank
PNZ-PanzerCC-OkMatty - Matilda MKII
LMG: Light Machine Gun
EDD - Enemy Destroyer DD - Destroyer
ETT - Enemy Freighter TT - Freighter
ATR - Anti Tank Rifle
Beddy - British troop transport truck
Vicky - British Vickers infantry fighting vehicle
DAC - British Daimler Armored Car
Ju - Ju52 troop transport aircraft, prepare for paratroopers
Char - Char B1 Bis, French heavy tank
Laffly - French troop transport truck
R35 - French Renault R35 light tank
S35 - French Somua S35 medium tank