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
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 (French: 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
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
- Georg Anton Friedrich Ast, German philosopher and philologist (1778–1841)
- Pat Ast, American actress and model (1941-2001)
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