| US abbr. | |
| abbr. auto. | under size; under steer; underselling |
| abbr. insur. | life information service |
| abbr. mil., air.def. | User segment |
| abbr. OHS | unsafe situation |
| USERS abbr. | |
| abbr. space | Unmanned Space Experiment Recovery System |
| User abbr. | |
| comp. abbr. | U |
| Users abbr. | |
| comp. abbr. | U |
|
Multi : 60 phrases in 10 subjects |
| Abbreviation | 46 |
| Chat and Internet slang | 1 |
| Computer networks | 1 |
| Computers | 1 |
| Electronics | 1 |
| Information technology | 5 |
| Military | 2 |
| Physics | 1 |
| Programming | 1 |
| University | 1 |