AST

AST, Ast, or ast may refer to:

Science and technology

 * Attention schema theory, of consciousness or subjective awareness

Computing

 * Abstract syntax tree, a finite, labeled, directed tree used in computer science
 * Anamorphic stretch transform, a physics-inspired signal transform
 * Andrew S. Tanenbaum (born 1944), American-Dutch computer scientist, sometimes identified as "ast"
 * Asynchronous System Trap, a mechanism used in several computer operating systems
 * Application Security Testing, testing the operation and security of a software application
 * Application Support Team, a team of Application Support Analysts supporting IT services delivered to users within an organisation, enabling the required operational processes needed for the business to be successful.

Medicine

 * Aspartate transaminase, an enzyme associated with liver parenchymal cells
 * Antibiotic sensitivity testing or antibiotic susceptibility testing, the measurement of the susceptibility of bacteria to antibiotics

Mathematics

 * Alternative set theory
 * Alternating series test

Organizations

 * Allied Security Trust, a patent holding company
 * AST Research, a defunct personal computer manufacturer
 * Association for Software Testing, US
 * AST (publisher), a Russian book publishing company
 * Arsenal Supporters' Trust, English football club supporters

Politics and government

 * Abwehrstelle or Ast, the local intelligence center in each military district in Nazi Germany
 * Alaska State Troopers, state police agency in Alaska, US
 * Chadian Social Action (Action Sociale Tchadienne), a former political party in Chad
 * Office of Commercial Space Transportation, of the US FAA

Education

 * ACT Scaling Test, for year 12 students, Australia
 * Advanced Skills Teacher, a teaching role in England and Wales
 * Air Service Training, a flight engineering training school
 * American School in Taichung, an international school in Taichung, Taiwan
 * American School of Tangier
 * American School of Tegucigalpa
 * American School of Tripoli
 * Atlantic School of Theology, Halifax, Nova Scotia, Canada
 * Avalanche Skills Training, Canada
 * Conroe ISD Academy of Science and Technology, Texas, US

Transport

 * Aldershot GO Station, Amtrak station code AST
 * Astoria Regional Airport (FAA Identifier and IATA code ), Clatsop County, Oregon, US
 * Aston railway station (National Rail code), Birmingham, England

Time zones

 * Atlantic Standard Time, UTC−4
 * Alaska Standard Time, UTC−9
 * Arabia Standard Time, UTC+3
 * Antigua and Barbuda Time, UTC−4

Other uses

 * Aviation Survival Technician, a US Coast Guard rating
 * AST Research, Inc., as known as AST Computer, a personal computer manufacturer
 * Asti, Italian province and city (was traditionally Ast in the Piemontese dialect)
 * Assured shorthold tenancy, UK
 * Asturian language (ISO 639 alpha-3: ), Spain
 * Astana Pro Team (UCI code AST), a professional road bicycle racing team
 * Georg Anton Friedrich Ast, German philosopher and philologist (1778–1841)
 * Pat Ast, American actress and model (1941-2001)