| Abbreviation | Definition |
|---|---|
| RQQ | Reliability Qualification Requirement |
| RQR | Rapid Quote Response |
| RR | Register Read |
| RR | Registered Representative |
| RRA | Registered Records Administrator |
| RRA | Rahanweyne Resistance Army |
| RRA | Resource Recovery Act |
| RRAD | Roll Rate Anomaly Detection |
| RRB | Regional Rural Bank |
| RRB | Radar Range Bearing |
| RRB | Reduced Readiness Battery |
| RRB | Radar Reflective Balloon |
| RRB | Reliability Requirements Board |
| RRB | Requirements Review Board |
| RRB | Readiness Review Board |
| RRB | Railway Recruitment Board |
| RRBI | Radar Range Bearing Indicator |
| RRC | Reactor Research Centre |
| RRD | Recurrence Rate Data |
| RRD | Removal - Replacement Data |
| RRD | Reduced Resolution Data |
| RRD | Reliability Requirements Database |
| RRD | Required Reply Date |
| RRDT | Rapid Response Documentation Team |
| RREA | Rendezvous Radar Electronics Assembly |
| RREL | Risk Reduction Engineering Lab |
| RREU | Rendezvous Radar Electronics Unit |
| RRF | Resource Recovery Facility |
| RRG | Referral Resource Group |
| RRG | Risk Retention Group |
| RRI | Rendezvous Radar Indicator |
| RRL | Rudder Reference Line |
| RRN | Rapid Response Network |
| RRO | Regional Reliability Organization |
| RRP | Rudder Reference Plane |
| RRPI | Rural Retail Price Index |
| RRR | Risk Reduction Review |
| RRS | Registered Relocation Specialist |
| RRS | Recreation And Resort Specialist |
| RRT | Registered Respitory Therapist |
| RRT | Rendezvous Radar Transducer |
| RRT | Rendezvous Radar Transponder |
| RRT | Repatriation Review Tribunal |
| RS | Register Select |
| RS | Replace String |
| RS | Reset |
| RS | Random Slew (plotters) |
| RS | Reed-Sternberg Cells |
| RS-232 | EIA standard for transmitting serial data |
| RS-422 | EIA standard for transmitting serial data |