Other
- Aat (queen), an ancient Egyptian queen consort of the 12th dynasty
- Administrative Appeals Tribunal, in Australia
- And Another Thing (disambiguation)
- Armored Assault Tank, fictional vehicle from Star Wars; see List of Star Wars air, aquatic, and ground vehicles
- Art & Architecture Thesaurus, a controlled vocabulary for describing artifacts, maintained by the Getty Vocabulary Program
- Association of Accounting Technicians
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