XY, or xy, or any of its variants may refer to:

Entertainment

  • Pokémon X and Y, a pair of 2013 role-playing video games in the Pokémon series
  • XY (magazine), a gay male youth magazine that also operated a personals website
  • X, Y, a 1993 novel by Michael Blumlein
  • X&Y, a 2005 album by Coldplay
  • Xy, a member of the band Samael

Film and television

  • Aktenzeichen XY… ungelöst, a German television series first broadcast in 1967
  • Kyle XY, an American sci-fi television series first broadcast in 2006
  • Pokemon The Series: XY, the 17th season of Pokémon and the first and titular season of Pokémon the Series: XY, first broadcast in 2013; named after the games
  • X+Y, a 2014 British film
  • X/Y, a 2014 American film
  • X&Y (film), a 2018 Swedish film
  • "XY", an episode of the 8th season of the television series Castle, first broadcast in 2018
  • XY Chelsea, a 2019 American-British documentary film about Chelsea Manning

Science and technology

  • the XY model, a lattice model of statistical mechanics
  • the XY problem, a problem of communication in software engineering and technical support situations

Genetics

  • XY sex chromosomes, in the XY sex-determination system found in many animals
  • a male, an organism typically having one X and one Y chromosome and producing sperm gametes that fuse with a female gamete during sexual reproduction
  • XY gonadal dysgenesis, also known as Swyer syndrome, a type of hypogonadism resulting in a phenotypical female with functionless gonads

Mathematics

  • and , symbols commonly used to denote variables in mathematical formulas
  • -coordinates, a system used to locate a point in two dimensions according to the cartesian coordinate system
  • and , symbols conventionally used to denote the domain and codomain of a function
  • The definition of an function that produces a hyperbolic paraboloid

Other uses

  • XY, IATA code of Flynas (formerly Nas Air), a Saudi low-cost airline
  • Xy (digraph), a digraph of the Romanized Popular Alphabet, used to write Hmong
  • XY, aircraft registration prefix for Myanmar

See also

  • XX (disambiguation)
  • Xyz (disambiguation)
  • YX (disambiguation)