These are L33T tiles for the board game Scrabble. It’s an entire set of 103 tiles that can be used with any Scrabble board to create an entirely new game. The new game is based on leetspeak and the website even includes an online dictionary so you can still challenge absolutely silly words like pwnz0r1z3d. For $14.99 you receive the 103 tiles and a satin pouch to go along with your already-purchased board game. The tiles are designed to look like old-school green-on-black terminal text. Unfortunately a game mod like this would require the leetspeakers to leave their computers for once and actually interact with each other—not via IM—which may be a difficult task to begin with.
