AT

AT or at may refer to:

Businesses and organizations

Awami Tahreek, a left-wing Pakistani political party
Labor Organisation of Brothers-in-Arms (Finnish: Aseveljien Työjärjestö), a political party in Finland

Atchison County, Kansas (county code)
The Appalachian Trail (A.T.), a 2,180+ mile long mountainous trail in the Eastern United States

Antigua and Barbuda, World Meteorological Organization country code
Ashmore and Cartier Islands (FIPS 10-4 territory code, and obsolete NATO country code)
At, Bihar, village in Aurangabad district of Bihar, India
Province of Asti, Italy (ISO 3166-2:IT code)
Australia, LOC MARC code

Anaerobic threshold, in physiology
Análisis transaccional (Spanish for "transactional analysis"), a psychological method
Antithrombin, a small protein molecule
Ataxia–telangiectasia, an immunodeficiency disorder
Athletic training
Atrial tachycardia

@ (or "at sign"), the punctuation symbol now typically used in e-mail addresses and tweets
at (command), used to schedule tasks or other commands to be performed or run at a certain time
IBM Personal Computer/AT
- AT (form factor) for motherboards and computer cases
- AT connector, a five-pin DIN connector for a keyboard
AT Protocol, a decentralized social networking protocol by Bluesky
The Hayes command set for computer modems (each command begins with the character string "AT")

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

Acceptance testing, in engineering
Anti-tank warfare
Appropriate technology, an ideological movement to scale technology to be appropriate to its context
Assistive technology, devices for people with disabilities
Audiotool, a digital audio workstation
Automatic transmission, in vehicles

At, a preposition
At (cuneiform), a cuneiform sign
At, 1/100 of a Lao kip, a unit of currency
AT (Ukrainian: Акціонерне товариство), a Ukrainian form of company, equivalent to joint-stock company
Aarne–Thompson classification system, used to classify folktales
Aviation electronics technician (United States Navy), a job specialty
A US Navy hull classification symbol: Fleet tug (AT)