| Abbreviation | Definition |
|---|---|
| UC | Ubiquitous Connectivity |
| UCA | Utility Communications Architecture |
| UCAID | University Corporation for Advanced Internet Development |
| UCC | User Created Contents |
| UCD | Universal Cable Descrambler |
| UCD | Upstream Channel Descriptor |
| UCHSC | University of Colorado Health Sciences Center |
| UCI | Unique Client Identifier |
| UCITA | Uniform Computer Information Transactions Act |
| UCN | User Centric Networking |
| UCS | Uniform Communication Standard |
| UDA | Universal Distributed Access |
| UDAAN | Utilizing Directional Antennas for Ad-Hoc Networking |
| UDC | Universal Domain Controller |
| UDC | Utility Data Center |
| UDDI | Universal Description, Discovery, and Integration |
| UDH | User Data Header |
| UDL | Uniform Data Link |
| UDL | Uniformly Distributed Load |
| UDL | Universal Data Link |