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 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 Lactate inflection point (LIP), is the exercise intensity at which the blood concentration of lactate and/or lactic acid begins to increase rapidly. It is often expressed as 85% of maximum heart rate or 75% of maximum oxygen intake. When exercisin ...

, in physiology * ''Análisis transaccional'' (Spanish for " transactional analysis"), a psychological method * Antithrombin, a small protein molecule * Ataxia–telangiectasia, an immunodeficiency disorder *

Athletic training Athletic training is an allied health care profession recognized by the American Medical Association (AMA)"What is an Athletic Trainer?". The Board of Certification Website. 2003. Athletic training is also recognized by the Health Resources Serv ...

Physics and chemistry

* Astatine (symbol At), a chemical element *

Ampere-turn The ampere-turn (A⋅t) is the MKS (metre–kilogram–second) unit of magnetomotive force (MMF), represented by a direct current of one ampere flowing in a single-turn loop in a vacuum. " Turns" refers to the winding number of an electrical con ...

(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 and its various subdisciplines, acceptance testing is a test conducted to determine if the requirements of a specification or contract are met. It may involve chemical tests, physical tests, or performance tests. In systems en ...

, in engineering * Appropriate technology, an ideological movement to scale technology to be appropriate to its context *

Assistive technology Assistive technology (AT) is a term for assistive, adaptive, and rehabilitative devices for people with disabilities and the elderly. Disabled people often have difficulty performing activities of daily living (ADLs) independently, or even with ...

, devices for people with disabilities *

Anti-tank warfare Anti-tank warfare originated from the need to develop technology and tactics to destroy tanks during World War I. Since the Triple Entente deployed the first tanks in 1916, the German Empire developed the first anti-tank weapons. The first devel ...

* Automatic transmission, in vehicles

Other uses

* At, a

preposition Prepositions and postpositions, together called adpositions (or broadly, in traditional grammar, simply prepositions), are a class of words used to express spatial or temporal relations (''in'', ''under'', ''towards'', ''before'') or mark various ...

At (cuneiform) The cuneiform sign at, is a common-use sign of the Amarna letters, the ''Epic of Gilgamesh,'' and other cuneiform texts (for example Hittite texts). It has secondary uses in the Amarna letters for ''"ad"''. Linguistically, it has the alpha ...

, a cuneiform sign * At, 1/100 of a

Lao kip The kip ( lo, ກີບ, kib; code: LAK; sign: ₭ or ₭N; french: kip; officially: ເງີນກີບລາວ, lit. "currency Lao kip") is the currency of Laos since 1955. Historically, one kip was divided into 100 ''att'' (). The term d ...

, a unit of currency * Aarne–Thompson classification system, used to classify folktales * Archive Team, a digital preservation group *

Aliança da Terra Aliança da Terra (AT), or the Land Alliance, is a Brazilian non-governmental organization that connects farmers, researchers, environmentalists and entrepreneurs in the agribusiness industry to promote environmental awareness and land management pr ...

, a Brazilian non-governmental organization * Alternative Tentacles, an independent record label * Auckland Transport, New Zealand, a public transport agency *

Autolinee Toscane Autolinee Toscane S.p.A. (also known as AT) is a private Italian company, wholly owned by RATP Dev, active in the local public transport sector. It manages several urban and suburban bus lines in Tuscany for a total of 1.7 million kilometres trav ...

, Italy, a public transport agency * Aviation electronics technician (United States Navy), a job specialty * Royal Air Maroc (IATA airline designator AT)