| Abbreviation | Definition |
|---|---|
| RND | Railroads for National Defense |
| RNI | Road Network Improvement |
| RNO | Reno/ Tahoe Cannon International Airport |
| RNP | Required Navigation Performance |
| RNPC | Required Navigation Performance Capability |
| RNR | Rent 'N Roam |
| RO | Roll On |
| RO | Roll Over |
| RO/RO | Roll On / Roll Off |
| ROA | Riders Of Apocalypse |
| RoADAR | RoSPA Advanced Drivers and Riders |
| ROB | Remaining On Board |
| ROC | Greater Rochester International Airport |
| ROC | Rail Operations Center |
| ROC | Reduce Oil Consumption |
| ROCSIM | Railroad Operations Computer Simulation |
| RODS | Record Of Duty Status |
| ROFL | Right Of Free Landing |
| ROG | Refinery Off- Gas |
| ROG | Rise Off Ground |