AT or at may refer to:

Geography

Austria

* Austria (ISO 2-letter country code) *

.at .at is the Internet country code top-level domain (ccTLD) for Austria. It is administered by nic.at. Second-level domains The .at top-level domain has a number of second-level domains: * .ac.at (reserved for academic institutions, especially u ...

, Internet country code top-level domain

United States

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

Elsewhere

* Anguilla (World Meteorological Organization country code) * Ashmore and Cartier Islands (FIPS 10-4 territory code, and obsolete NATO country code) *

At, Bihar At is a village in Aurangabad, Bihar, India. It is in the Madanpur tehsil A tehsil (, also known as tahsil, taluka, or taluk) is a local unit of administrative division in some countries of South Asia. It is a subdistrict of the area within a d ...

, village in Aurangabad district of Bihar, India * Province of Asti, Italy (ISO 3166-2:IT code)

Science and technology

Computing

* @ (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 * The Hayes command set for computer modems (each command begins with the character string "AT")

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

Physics and chemistry

* Astatine (symbol At), a chemical element * 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 (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 * Anti-tank warfare * Automatic transmission, in vehicles

Other uses

* At, a preposition * At (cuneiform), a cuneiform sign * At, 1/100 of a Lao kip, a unit of currency * Aarne–Thompson classification system, used to classify folktales * Archive Team, a digital preservation group * Aliança da Terra, a Brazilian non-governmental organization * Alternative Tentacles, an independent record label * Auckland Transport, New Zealand, a public transport agency * Autolinee Toscane, Italy, a public transport agency * Aviation electronics technician (United States Navy), a job specialty * Royal Air Maroc (IATA airline designator AT)