| Meaning | Category |
| Canadian Unitarian Council | Community->Religion |
| Candidatura de Unidad Comunista | International->Spanish |
| Comité de Unidad Campesina | International->Guatemalan |
| Common User Contract | Governmental->Military |
| Computer Usage Control | Governmental->NASA |
| Computer Users Committee | Academic & Science->Ocean Science |
| Convenio Único de Coordinación | International->Mexican |
| Cucuta, Colombia | Regional->Airport Codes |
| Customer Unit Cost | Business->Products |
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