AST

AST is a three-letter abbreviation that stands for a number of different things.

In mathematics it refers to the Alternating series test.
In medicine it refers to the enzyme aspartate transaminase.
In computer science it means abstract syntax tree.
AST Research, Inc. manufactured personal computers between 1980 and 1999. The name was then owned by AST Computers, LLC.
In aviation, it means Advanced Supersonic Transport.
In space, it means the Office of Commercial Space Transportation.
AST is an abbreviation for two time zones:
- Alaska Standard Time - note that "AKST" is commonly used to designate Alaska Standard Time, to distinguish between Atlantic and Alaskan time
- Atlantic Standard Time
AST Sports Science is a manufacturer and marketer of nutritional supplements.
Asturian language (ISO 639 alpha-3, ast)
Asynchronous System Traps, a feature of certain DEC operating systems.
Alpha Sigma Tau is a popular sorority at colleges across the United States.
ACT Scaling Test is a series of aptitude tests taken by Year 12 students in ACT, Australia.
Andrew S. Tanenbaum (a well-known computer scientist) often uses this acronym as his identifier.
Adequacy Style Troll
The National Rail code for Aston railway station, United Kingdom.
Alternative Set Theory
Atlantic School of Theology
Action Sociale Tchadienne or Chadian Social Action, a Chadian political party