AT or at may refer to:

Geography

Austria

Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...

(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 Anguilla ( ) is a British Overseas Territory in the Caribbean. It is one of the most northerly of the Leeward Islands in the Lesser Antilles, lying east of Puerto Rico and the Virgin Islands and directly north of Saint Martin. The territo ...

(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 The Province of Asti ( it, Provincia di Asti, Piedmontese: ''Provincia d’Ast'') is a province in the Piedmont region of northern Italy. Its capital is the city of Asti. To the northwest it borders on the Metropolitan City of Turin; to the sou ...

, 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)