XO
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