There are many different abbreviations used by people on TPMRPG so it is improtant to know what they are. Credit to Mitran for posting most of these on the User Created Guides section of the forum.
IG: In Game
FT: For Trade
FS: For Sale
FTP: For Training Prize
UFT/UFS/UFTP: Up For Trade/Sale/Training Prize
NFT: Not for Trade
Ob: Obtainable
Unob: Unobtainable
RP: Roleplay
LF: Looking For
Pkmn: Pokemon
SML: Secret map legendary
Will update in the future if i missed any/if new ones are created.