Xo or XO may refer to:

Arts and Entertainment

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Songs

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Businesses

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Food and drink

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Science and technology

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  • XO Telescope or its exo-planet survey
  • OLPC XO, a laptop produced by the One Laptop per Child association
  • XO sex determination system, a chromosomal system used to designate sex of some species of insects, arachnids, and mammals
    • XO, heterogametic male designation under this system
  • Turner syndrome, a genetic condition in which one of the sex chromosomes is absent
  • Xanthine oxidase, an enzyme that catalyzes the oxidation of hypoxanthine to xanthine
  • Xylenol orange, a chemical indicator for metal ions, used in titrations
  • Crystal oscillator (deprecated abbreviation: XO), an electronic circuit

Other uses

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See also

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