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 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 (), 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 AST), 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: ast), Spain Astana Pro Team (UCI code AST), a professional road bicycle racing team Pat Ast, American actress and model (1941-2001)