| Meaning | Category |
| Lutsk, Russia | Regional->Airport Codes |
| Ultimate Clan Killers | Miscellaneous->Funnies |
| Universal Chemical Key | Academic & Science->Chemistry |
| Universal Correlation Key | Computing->Security |
| Universal Cuff Key | Miscellaneous->Clothes |
| Ushtria Clirimtare e Kosoves | Governmental->Military |
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