XP

XP may refer to:

Science and technology

Computing

• Windows XP, a Microsoft operating system
• Microsoft Office XP, a version of the software suite
• Athlon XP, a series of AMD microprocessors
• Extreme programming, a software development methodology
• XP (class), a complexity class in parameterized complexity

Medicine

• Xanthelasma palpebrarum, a cholesterol deposit in the eyelid
• Xeroderma pigmentosum, a genetic disorder

Other technology

• Ilford XP, a chromogenic black and white film made by Ilford Photo

Transport

• Boeing XP-7, a prototype United States biplane fighter of the 1920s
• Experimental pursuit, a USAAC aircraft designation, used by e.g. the Lockheed XP-38 Lightning
• Avelo Airlines (IATA code: XP), an American ultra low-cost airline

Other uses

• XP Inc., a Brazilian investment management company
• Experience point, a unit for measuring a character's progress in role-playing games

• XP, an emoticon
• X phrase, in X-bar theory in linguistics

See also

• The Greek abbreviation ΧΡ (☧, or chi-rho), a Christian symbol for Christ