| Abbreviation | Definition |
|---|---|
| ULS | Universal Link System |
| ULSD | Ultra Low Sulfur Diesel |
| ULT | Ultra Light Trigger |
| ULU | uuluuraq |
| ULV | UL-approved, Inductive resistor, Vertical |
| ULWC | Ultra Light Weight Coated |
| ULX | Ultra Luminous X |
| ULZ | Unidirectional high-strength Laminated Zenton fiberglass |
| UMF | Universal Music Floor |
| UMJ | Ulti-Mate Junior Cushion |
| UMK | Universal Mounting Kit |
| UMK | Uplighter Mounting Kit |
| UML | Unified Modeling Language (IBM Rational software) |
| UMZ | USAScopes Microscope, Zoom (Microscope for Ophthalmology) |
| UNC | Unified National Coarse |
| UNR | Unified National Refined |
| UNS | Unified Numbering System |
| UNSPSC | United Nation Standard Products and Services Code |
| UOP | United Oil Products |
| UPC | Unit Purchase Cost |