- (initialism) . Adults Only.
- (initialism) . Anarchy Online.
- (initialism) . Autonomous Oblast.
- (initialism) . (US, Navy) Auxiliary Oiler - a naval oil tanker with the ability to perform underway replenishment of fuel oil or ship oil to ships of the fleet.
- Proper noun. A tribe living primarily in the state of Nagaland in India.
- Proper noun. Their language, belonging to the Tibeto-Burman language family.
- Abbreviation. among(st) others.
- Abbreviation. and others.