| item | description | category | filter | more on... |
| UCK | Lutsk, Russia | Regional/Airport Codes |
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| UCK | Universal Chemical Key | Edu./Chemistry |
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| UCK | Universal Correlation Key | IT/Security |
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| UCK | Universal Cuff Key | Misc/Chess |
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| UCK | Ushtria Clirimtare e Kosoves (Kosovo Liberation Army) | Governmental/Military |
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