AT or at may refer to:
Language At, a preposition At (cuneiform), a cuneiform sign
Science and technology
Biology and medicine 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 Aliança da Terra, a Brazilian NGO that promotes environmental awareness and land management practices
Computing .at, the Internet ccTLD for Austria @ (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")
Physics and chemistry 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
Other uses in science and technology Acceptance testing, in engineering 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
Transportation and military Automatic transmission, in vehicles Auckland Transport, New Zealand, a public transport agency Autolinee Toscane, Italy, a public transport agency Royal Air Maroc (IATA airline designator AT) A US Navy hull classification symbol: Fleet tug (AT) Aviation electronics technician (United States Navy), a job specialty Anti-tank warfare
Business At, 1/100 of a Lao kip, a unit of currency AT (), a Ukrainian form of company, equivalent to joint-stock company
Political parties Awami Tahreek, a left-wing Pakistani political party Labor Organisation of Brothers-in-Arms (), a political party in Finland
Places Austria, a country in Central Europe, by ISO 3166 alpha-2 code Atchison County, Kansas, United States (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
Other uses Aarne–Thompson classification system, used to classify folktales Archive Team, a digital preservation group Alternative Tentacles, an independent record label
See also
AT1 (disambiguation) ATS (disambiguation)