| Abbreviation | Definition |
|---|---|
| RTZ | Reversal Trigger Zone |
| RTZ | Rio Tinto |
| RU | Rambunctious Umbrellas |
| RU | Ramp Up |
| RU | Rare Use |
| RU | Recognition Unit |
| RU | Reduced Units |
| RU | Release Update |
| RU | Resistance Units |
| RU | Resource Unit |
| RU | Roussel Uclaf |
| RU | Running Up |
| RU | Rural Utopia |
| RU | Russian UK |
| RU | Rustic Upbringing |
| RUA | Reflexo on Urban Art |
| RUA | Remolcadores Unidos Argentinos |
| RUA | Reporting URI for Aggregate |
| RUA | Reporting URI of Aggregate |
| RUA | Role Understanding and Acceptance |