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 ''Kyle XY'' is an American science fiction television series produced by ABC Family. The central character is a teenage boy (Matt Dallas) who awakens naked in a forest outside Seattle, Washington, with no more knowledge or abilities than a newb ...

'', 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 ''XY Chelsea'' is a 2019 American-British documentary film directed by Tim Travers Hawkins, written by Travers Hawkins, Mark Monroe, Enat Sidi, and Andrea B. Scott. Laura Poitras serves as an executive producer. The film follows Chelsea Manning, ...

'', a 2019 American-British documentary film about Chelsea Manning

Science and technology

* the

XY model The classical XY model (sometimes also called classical rotor (rotator) model or O(2) model) is a lattice model of statistical mechanics. In general, the XY model can be seen as a specialization of Stanley's ''n''-vector model for . Definition G ...

, a lattice model of statistical mechanics * the

XY problem The XY problem is a communication problem encountered in help desk, technical support, software engineering, or customer service situations where the question is about an end user's attempted solution (''Y'') rather than the root problem itself (' ...

, a problem of communication in software engineering and technical support situations

Genetics

* XY sex chromosomes, in the

XY sex-determination system The XY sex-determination system is a sex-determination system used to classify many mammals, including humans, some insects (''Drosophila''), some snakes, some fish (guppies), and some plants (''Ginkgo'' tree). In this system, the sex of an indi ...

found in many animals ** a

male Male (symbol: ♂) is the sex of an organism that produces the gamete (sex cell) known as sperm, which fuses with the larger female gamete, or ovum, in the process of fertilization. A male organism cannot reproduce sexually without access to ...

, 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 A Cartesian coordinate system (, ) in a plane is a coordinate system that specifies each point uniquely by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular oriented lines, measured in t ...

* and , symbols conventionally used to denote the domain and codomain of a function * The definition of an function that produces a

hyperbolic paraboloid In geometry, a paraboloid is a quadric surface that has exactly one axis of symmetry and no center of symmetry. The term "paraboloid" is derived from parabola, which refers to a conic section that has a similar property of symmetry. Every plane ...

Other uses

* XY, IATA code of

Flynas Flynas ( ar, طيران ناس), stylized ''flynas'', formerly Nas Air, is a Saudi low-cost airline, the country first budget airline. The company's head office is located in Riyadh. History Saudi Arabian Airlines was the only airline in the co ...

(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