XO stands for:

  • Executive officer, executive officer in the military
  • Experimental Ophthalmology, a professor at the University of the Saarland
  • Extra Old, Age predicate name for brandy and cognac, see Very Special Old Pale
  • LTE International Airways, Spanish airline ( IATA code )
  • OLPC XO -1, a laptop that has been designed especially for children in developing countries
  • Quartz oscillator
  • Orbit, as ISO -3166 -2 code
  • XO Communications, a North American telecommunications companies

XO as distinguishing signs on license plate:

  • Greece: Chios, kept free for future approvals

See also:

  • X0
  • XOXO
  • Disambiguation
  • Abbreviation