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

Astatine, the element with the chemical symbol At.
Ampere-turn (symbol), an International System of Units (MKS) unit of magnetomotive force
A subdivision equal to 1/100 of a Kip, the unit of currency in Laos
Attotesla, 10⁻¹⁸ tesla, an SI derived unit of magnetic flux density
Technical atmosphere (symbol), physical unit of pressure
Aarne-Thompson classification system
Acceptance test
Análisis transaccional (Spanish "Transactional analysis"), a psychological method
Ataxia telangiectasia, an immunodeficiency disorder
Appropriate technology
Assistive technology
Automatic transmission
Antithrombin

IBM Personal Computer/AT
- AT form factor for motherboards and computer cases
- The common name for the 5-pin DIN keyboard connector
Hayes command set for computer modems (all commands begin with the characters "AT")
@ (or "at sign"), the punctuation symbol now typically used in e-mail addresses (and more recently, tweets)
at (Unix), to schedule tasks to be performed at a later date
at (Windows), to schedules other commands to be run at a certain time