XP

XP may refer to:

• Windows XP, an operating system by Microsoft
• Office XP, a Microsoft Office version
• ΧΡ (Chi Rho) are the Greek letters that form the Labarum, or the first two letters of "Christ" in Greek
• Athlon XP, a line of central processing units by AMD
• Cross-platform ("X" looks like a saltire cross and is often used to replace this word or its synonyms in abbreviations)
• An emoticon expressing disgust, general discontentedness, sticking one's tongue out (a more forceful version of :P), or 'being dead'. The X represents wincing or crossed out eyes, while the P represents a mouth with a tongue sticking out.
• Experience points, in a role-playing game, representation of a character's advancement and improvement in skills
• Extreme Programming, a software engineering methodology
• Xeroderma pigmentosum, a rare genetic disorder
• Xtra Airways IATA code
• In theoretical linguistics, any kind of a phrase, such as a noun phrase (NP), an adjectival phrase (AP), a prepositional phrase (PP) etc.
• XP (complexity class)