L8R
Shorthand for later, L8R also sometimes abbreviated as L8ER is commonly used in chat rooms and other text-based communications as a way of saying good bye. Below is an example of how this could be used in chat.
User1: Ok I've G2G
User2: L8R
<User1 has disconnected>
Also see: B4N, BBIAB, BBL, Chat definitions, CYA, G2G