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 Samael (; , ''Sammāʾēl'', "Venom of God"; , ''Samsama'il'' or , ''Samail''; alternatively Smal, Smil, Samil, or Samiel) is an archangel in Talmudic and post-Talmudic tradition; a figure who is the accuser or adversary (Satan#Judaism, Satan ...

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 created by Eric Bress and J. Mackye Gruber and produced by ABC Signature, ABC Studios. The central character is a teenage boy (Matt Dallas) who awakens naked in a forest outside Seattl ...

'', an American sci-fi television series first broadcast in 2006 * '' Pokémon 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 XY, or xy, or any of its variants may refer to: Entertainment * ''Pokémon X and Y, Pokémon X'' and ''Y'', a pair of 2013 role-playing video games in the Pokémon video game series, ''Pokémon'' series * XY (magazine), ''XY'' (magazine), a gay ...

'', 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 ...

, 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 (''X'') 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 present in many mammals (including humans), some insects (''Drosophila''), some snakes, some fish (guppy, guppies), and some plants (''Ginkgo'' tree). In this system, the sex of an ...

found in many animals ** a

male Male (Planet symbols, symbol: ♂) is the sex of an organism that produces the gamete (sex cell) known as sperm, which fuses with the larger female gamete, or Egg cell, ovum, in the process of fertilisation. A male organism cannot sexual repro ...

, 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 XY complete gonadal dysgenesis, also known as Swyer syndrome, is a type of defect hypogonadism in a person whose karyotype is 46,XY. Though they typically have normal vulvas, the person has underdeveloped gonads, fibrous tissue termed " streak go ...

, 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 Variable may refer to: Computer science * Variable (computer science), a symbolic name associated with a value and whose associated value may be changed Mathematics * Variable (mathematics), a symbol that represents a quantity in a mathemat ...

in mathematical formulas * -coordinates, a system used to locate a point in two dimensions according to the

cartesian coordinate system In geometry, a Cartesian coordinate system (, ) in a plane (geometry), plane is a coordinate system that specifies each point (geometry), point uniquely by a pair of real numbers called ''coordinates'', which are the positive and negative number ...

* and , symbols conventionally used to denote the domain and codomain of a

function Function or functionality may refer to: Computing * Function key, a type of key on computer keyboards * Function model, a structured representation of processes in a system * Function object or functor or functionoid, a concept of object-orie ...

* 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 pla ...

Other uses

* XY, IATA code of

Flynas Flynas (stylized flynas; ), formerly Nas Air, is a private Saudi low-cost airline "joint-stock company". It is the first low-cost airline in Saudi Arabia. The company's headquarters are located in Riyadh. It operates more than 1,500 flights pe ...

(formerly Nas Air), a Saudi low-cost airline *

Xy (digraph) This is a list of digraphs used in various Latin alphabets. In the list, letters with diacritics are arranged in alphabetical order according to their base, e.g. is alphabetised with , not at the end of the alphabet, as it would be in Danish, ...

, a digraph of the Romanized Popular Alphabet, used to write Hmong * XY, aircraft registration prefix for