| Acronym | Definition |
|---|
| RRU➣Remote Radio Unit (telecommunications) |
| RRU➣Royal Roads University (Victoria, British Columbia, Canada) |
| RRU➣Rock Raiders United (Lego enthusiast group) |
| RRU➣Règlement Régional d'Urbanisme (French: Regional Planning Regulations; Belgium) |
| RRU➣Radio Remote Unit (antenna connection) |
| RRU➣Radio Research Unit |
| RRU➣Relief and Recovery Unit (UN) |
| RRU➣Research/Recertify/Upgrade (security clearance) |
| RRU➣Rural Regeneration Unit (UK) |
| RRU➣Remington Rand UNIVAC |
| RRU➣Reduced-Resolution Update |
| RRU➣Request to Research/Upgrade (Joint Personnel Adjudication System) |
| RRU➣Remote Reset Unit |
| RRU➣Responsible Radiation User (McGill University; Montreal, Canada) |