| Abbreviation | Definition |
|---|---|
| UGZ | Upper Glass Zone |
| UHMWPE | ultra high molecular weight polyethylene |
| UHP | Ultra Hal Plug |
| UHPA | Utah Heritage Products Alliance |
| UHT | Ultra Heat Treated |
| UHTS | Ultra High-Tech Starlite |
| UHW | Ultimate Heavy-duty Walk-In oven |
| UIO | Units In Operation |
| UIP | United International Products |
| UIV | Union Insert Valve |
| UJH | Universal Jack - heavy duty |
| UL | Underwriters Labratories |
| UL/FM | Underwriters Laboratories and/or Factory Mutual |
| UL/FM | UnderWriters laboratories / Factory Mutation |
| UL/FM | Underwriters Laboratories and/or Factory Mutual |
| ULD | Ultra- Light Dual |
| ULD | Ultra Low Dispersion |
| ULG | Unleaded Motor Gasoline |
| ULH | UL-approved, Inductive resistor, Horizontal |
| ULQ | Ultra Low Quality |