TY
Online poker room abbreviation meaning 'Thank You'. There are many others, such as tx, tu, tnx, ta or simply t.

Generally used in response to a comment such as 'nice hand', 'nice bet' or similar, this is simple good manners. However, some of the more rude online players will say 'thank you' to a player that might have called their all-in and doubled them up. That's not a nice use of the term and should be avoided by the better player.