| U/L | Upload |
| UAE | Unrecoverable Application Error (Bane of Windows' users!) |
| UBD | User Brain Damage |
| UDS | Ugly Domestic Scene |
| UL | Upload |
| UOK | yoU OK? |
| UNA | Use No Acronyms |
| UNCLE | Unified Nuclear Coalition of Latvian Emigrants |
| URLCM | yoU aRe weLCoMe |
| USU | USUally (frequently just "usu.") |
| UTC | Under The Counter; Coordinated Universal Time; |
| Temps Universel Coordonnie | |
| UTT | Under The Table |
Unless otherwise noted, all photos and text is Copyright © Richard G Lowe, Jr.