- Initialism of Alaskan Standard Time.
- Initialism of Atlantic Standard Time.
AST (countable and uncountable, plural ASTs)
- (aviation) Initialism of advanced supersonic transport.
- (computing) Initialism of abstract syntax tree.
- (medicine) Initialism of aspartate transaminase.
- (sports) Initialism of average shot time. The average time taken by a player on each shot recorded using World Snooker scoring system.
- ATS, ATs, S. A. T., S.A.T., SAT, STA, Sat, Sat., Sta, Sta., T.A.s, TA's, TAS, TAs, TSA, Tas, Tas., at's, ats, sat, sat., sta, tas