| RO | REality Orientation |
|---|---|
| RO | Reactive oxygen |
| RO | Relative Odds |
| RO | Reverse Osmosis |
| ROA | Raman Optical Activity |
| ROAT | Repeated Open Application Test |
| Robo | Roundabout |
| ROC | Receiver Operating Characteristic |
| ROC | Receive operator characteristic |
| ROC | Receiver Operating Characteristic Curve |