AO

AO, aO, Ao, or ao may refer to:

Arts and entertainment

• Adults Only, an entertainment rating
• AO Music, a world music / ethnic fusion music group
• AO Recordings, a record label
• Lord Ao, a fictional deity in the Dungeons & Dragons universe
• Eureka Seven: AO, Japanese mecha anime television series

Businesses and organizations

• AO Foundation (originally Arbeitsgemeinschaft für Osteosynthesefragen), a non-profit organisation dedicated to the treatment of trauma and disorders of the musculoskeletal system
• AO World, a UK retailer of household appliances trading under the brand name ao.com
• Aktsionernoye Obschestvo, a Russian type of corporate entity similar to a joint-stock company
• Athletics Ontario, formally Ontario Track and Field Association (OTAF)
• Australian Airlines (IATA code AO)

Government and politics

• Angola (ISO code and NATO country code AO)
• Autonomous oblast or autonomous okrug, types of Russian administrative divisions
• Administrative Office of the United States Courts
• NSDAP/AO, Foreign Organization branch of the Nazi Party
• Officer of the Order of Australia, postnominal AO

Military

• Area of operations, a U.S. military term
• AO, a U.S. Navy hull classification symbol for an oiler
• AO-, the prefix for several firearms
• Aviation Ordnanceman, a United States Navy occupational rating

Mythology and religion

• Ao (mythology), a deity in Māori mythology
• Ao (turtle), a creature in Chinese mythology
• Ao, a type of Easter Island wood carving
• Alpha and Omega (abbreviation)

Science and technology

• .ao, top-level Internet domain code for Angola
• Adaptive optics, an astronomical imaging technology
• Ambient occlusion, a shading method in computer graphics
• AMSAT-OSCAR, a satellite naming convention
• Applied Optics, scientific journal published by the Optical Society of America (OSA)
• Arctic oscillation, a climate pattern

Surnames

• Ao (surname), a Chinese surname
• Ou (surname), romanized as Ao in Cantonese

Other uses

• Ao (color)
• Ao languages
• Ao Naga, an Indian ethnic group
• Aaron Owens (born 1976), American streetball player
• Alphabetically ordered
• Australian Open, common backronym for AO
• ao, außerordentlicher, e.g. ao Prof., "Professor extraordinarius"

See also

• Alpha and Omega (disambiguation)
• Todd-AO
• All pages with titles beginning with AO
• All pages with titles containing AO
• A0 (disambiguation)