XY

XY may refer to:
*(in science)
**$xy$ coordinates, used to locate a point in two dimensions according to the cartesian coordinate system.
**XY sex-determination system in biology.
**XY model in physics.
**XY problem is a term from computer programming. It is when a person has a problem X, and thinks Y is the proper solution, and asks how to do Y.
*(in spelling)
**"xy", a digraph of the Romanized Popular Alphabet, used to write Hmong.
*(in music)
**"X&Y", an album by Coldplay.
**"XY" is a magazine published in the United States that also operates a personals website. Both are intended for young gay, bi, and lesbian youth.
**Xy (used to be known as Xytras) is a member of the band Samael.
**SBO XY, an electric guitar from SBO Custom Guitars
*(other)
**XY Company, a Montreal-based fur company that existed from 1798-1804.
** Kyle XY a television show broadcast by the American Broadcasting Company.