Acronyms
- Ulster Transport Authority
- Undergraduate Teaching Assistant
- Undergraduate Theatre Association, a student organization at the University of Wisconsin–Madison
- Unidade de Tratamento de Ar, part of an HVAC system, in Portuguese (AVAC)
- Union de Transports Aériens, a defunct French airline
- Union des Transports Aériens de Guinée, a Guinean and Lebanese joint venture
- United Talent Agency, a Hollywood talent agency
- United Telekom Austria
- Utah Transit Authority, a public transportation agency in the Wasatch Front of Utah
- United Train of Artillery
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