underground storage tank
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UST or Ust may refer to:
- Equatorial Guinea Workers' Union
- Northeast Florida Regional Airport in St. Augustine, Florida (IATA Airport Code UST)
- Underground storage tank
- Uniform spanning tree, a mathematical concept
- United States Television Manufacturing Corp.
- Union of Trade Unions of Chad (Union des Syndicats du Tchad)
- Universal Standard Time
- Universal Standard for Tubeless, a tubeless bicycle tire system developed by Mavic
- UST Growling Tigers, men's varsity team
- U.S. Smokeless Tobacco Company, a subsidiary of UST Inc.
- .ust, file extension for plain-text Utau voice sequence files
- Unsepttriium, an unsynthesized chemical element with atomic number 173 and symbol Ust