| Acronym | Definition |
|---|
| Uuu➣Unununium (element 111) |
| Uuu➣Uniface Underground (hacker site) |
| Uuu➣Unknown Unix User |
| Uuu➣University Unions United (umbrealla organization of college trade unions) |
| Uuu➣Ugueth Urtain Urbina (baseball player) |
| Uuu➣University Unitarian Universalist |
| Uuu➣Universe and Universe's Universal Space Travel (Steven Universe TV show) |