- Slang often used for describing Microsoft Windows XP.
- When referring to a game, XP is also used as an abbreviation for eXPerience. XP is often gained when a player in a game defeats or kills an opponent at equal or greater skill. When the player gets enough experience his or her level will increase.
- XP is also used to describe the AMD Athlon XP processors.
- Finally, XP or xP is also an emoticon with its tongue out.