AT

The word at is an English word, which may act as a preposition.

AT (or similar) may also refer to:

Places

Austria's ISO, 2-letter country code
- .at, the Internet country code top-level domain for Austria
Anguilla, a World Meteorological Organization country code
Ashmore and Cartier Islands (FIPS 10-4 territory code and obsolete NATO country code
Atchison County, Kansas (county code)
Province of Asti, a province of Italy in the ISO 3166-2:IT code
At, Bihar, a village in Aurangabad district, Bihar
Appalachian Trail, an over 2,000 mile long trail in the eastern United States

@ (or "at sign"), the punctuation symbol now typically used in e-mail addresses (and more recently, tweets)
at (Unix), a command used to schedule tasks to be performed at a certain time
at (Windows), a command used to schedule other commands to be run at a certain time
IBM Personal Computer/AT
- AT form factor for motherboards and computer cases
- A five-pin DIN connector for a keyboard
Hayes command set for computer modems (all commands begin with the characters "AT")

Anaerobic threshold, in physiology
Análisis transaccional (Spanish "Transactional analysis"), a psychological method
Antithrombin, a small protein molecule that inactivates several enzymes of the coagulation system
Ataxia telangiectasia, an immunodeficiency disorder

Astatine, a chemical element with symbol At
Ampere-turn (symbol At), an International System of Units (MKS) unit of magnetomotive force
Attotesla, 10⁻¹⁸ tesla, an SI derived unit of magnetic flux density
Technical atmosphere, a physical unit of pressure

Acceptance test, in engineering
Appropriate technology, an ideological movement founded by economist Dr. Ernst Friedrich "Fritz" Schumacher
Assistive technology, devices for people with disabilities
Anti-tank weapon
Automatic transmission, in vehicles