Urine Processor Assembly
Ulster Protestant Action
UltraSPARC Port Architecture
unitary-pole approximation
Urokinase plasminogen activator
Usability Professionals' Association
Air Foyle
Ultra Port Architecture
Ultrafine-Particle Analyzer
ultraperforming algorithm
Underprivileged Area
Uniform Parentage Act
United Printers Association
United Progressive Alliance
Univeristy Property Administration
Universal Port Architecture
Universities Personnel Association
University of Pennsylvania
University Photographers Association
University Preparatory Academy
University Press of America, Inc.
Unreimbursed Public Assistance
Uranium Palladium Aluminide
Uranium Producers of America
Urban Programme Authority
Urban Promise Academy
Urban Protection Agency
urinary plasminogen activator
urinary-type plasminogen activator
urinase type plasminogen activators