WTT is very similar to WTS and WTB and is known as Want to Trade.
- Player A has something they no longer need and mystery Player B wants it.
- Player A would type in chat "WTT [*item name here*] PM me offers" (or "WTT [*item name here*] for [*item name here*]) and it would be broadcast to all in the area.
- Player B sees this and might have what player A would be interested in.
Then the two would trade.