| Abbreviation | Definition |
|---|---|
| RRX | railroad crossing |
| RS | Racing Sport |
| RS | Rail Schedule |
| RS | Railway Station |
| RS | Rallye Sport |
| RS | Remote Start |
| RS | Road Sport |
| RS | Road Switcher |
| RS | Rock Salt |
| RSA | Road Safety Audit |
| RSA | Runway Safety Area |
| RSC | Real Scary Celica |
| RSC | Rugged Sport Coupe |
| RSD | Real Street Drags |
| RSE | Relative Standard Error |
| RSF | Roadway Safety Foundation |
| RSI | Return and Schedule Information |
| RSLS | Runway Status Light System |
| RSLV | Radially Segmented Launch Vehicle |
| RSLV | Reusable Satellite Launch Vehicle |