AST

AST may refer to:

Computing

• Abstract syntax tree, a finite, labeled, directed tree used in computer science
• Andrew S. Tanenbaum, a computer scientist (often uses this acronym as his identifier)
• Asynchronous System Traps, a mechanism used in several computer operating systems

Medicine

• Aspartate transaminase (or SGOT), an enzyme associated with liver parenchymal cells
• Agitated saline test (agitated saline contrast test), a diagnostic heart procedure
• Antibiotic susceptibility testing

Mathematics

• Alternating series test, tests whether infinite series converge
• Alternative set theory, an alternative mathematical approach to the concept of set

Organisations and companies

• Allied Security Trust, a patent holding company
• AST Research, a defunct personal computer manufacturer
• Association for Software Testing, US
• AST (publisher)

Education

• ACT Scaling Test, for year 12 students, Australia
• Avanti Schools Trust, UK sponsor of state-funded Hindu schools
• Alpha Sigma Tau, a national collegiate sorority of the United States
• Atlantic School of Theology, an ecumenical university in Atlantic Canada
• Conroe ISD Academy of Science and Technology, Texas, USA
• Avalanche Skills Training, Canada
• American School of Tangier
• American School of Tegucigalpa
• American School of Tripoli
• Advanced Skills Teacher, a teaching role in England and Wales
• Air Service Training, a flight engineering training school

Politics and government

• Office of Commercial Space Transportation, a branch of the US FAA
• Aviation Survival Technician, a United States Coast Guard rating
• Alaska State Troopers, US state police force
• Chadian Social Action (Action Sociale Tchadienne), a defunct Chadian political party

Transport

• Astoria Regional Airport, airport of Clatsop County, Oregon, US, FAA Identifier
• Aston railway station, National Rail code for station in Birmingham, England,

Time zones

• Atlantic Standard Time — UTC-4
• Alaska Standard Time — UTC-9
• Arabia Standard Time — UTC+3

Other

• Asti, Italian province and city (was traditionally Ast in the Piemontese dialect spoken there)
• Assured shorthold tenancy, UK
• Asturian language, Spain (ISO 639 alpha-3, ast)
• Arsenal Supporters' Trust, English football club supporters
• Astana Team, the UCI code for the professional road bicycle racing team