| Abbreviation | Definition |
|---|---|
| TYX | Transfer Y to X |
| TYZ | Transfer Y to Z |
| TZX | Transfer Z to X |
| TZY | Transfer Z to Y |
| U | Upsilon |
| UA | Uniform Asymptotic |
| UAR | Uniformly At Random |
| UB | Upper Bounds |
| UB1 | Upper Bound number 1 |
| UB2 | Upper Bound number 2 |
| UBV | Upper Bound Value |
| UC | Unary Counting |
| UC | Uncoupled Chains |
| UCPP | Undirected Chinese Postman Problem |
| UCS | User Coordinate System |
| UCSMP | University of Chicago School Mathematics Project |
| UD | Uniformly Distributed |
| UDA | Universal Descriptive Algebra |
| UDG | Unconditional Dependency Graph |
| UDT | UnDefined Term |