XO

XO may refer to:

  • XO, a grade of cognac, meaning "extra old"
  • XO, the IATA code for Spain's LTE International Airways
  • XO Communications, a telecom company
  • XO sauce, a spicy seafood sauce
  • XO Telescope and its related exo-planet survey
  • XO-1 laptop, produced by the One Laptop per Child association
  • XO-3 laptop, next generation One Laptop per Child laptop
  • Crystal oscillator, an electronic circuit that uses the mechanical resonance of a vibrating crystal to create an electrical signal with a precise frequency
    • XO, the now-deprecated abbreviation for crystal oscillators on electrical schematic diagrams
  • Executive officer in the military
  • Executive order (disambiguation), an edict by a member of the executive branch of a government
  • Eastern Orthodox Christianity (from the Greek: Χριστιανός Ορθόδοξος, Xristianos Orthodoksos)
  • Hugs and kisses, sometimes written as a sequence of XOs
  • Xanthine oxidase, an enzyme that catalyzes the oxidation of hypoxanthine to xanthine

Read more about XO:  Music