| Abbreviation | Definition |
|---|---|
| RAP | Response Analysis Program |
| RAPS | Remote Area Power Supply |
| RARP | Runs Above Replacement Position |
| RAS | Remote Analysis System |
| RAS | Sun Raster Image format |
| RASP | Reactor And Separation Processor |
| RAVEN | Records And Verification Electronic Network |
| RAW | Raw file image format |
| Raz | Auto-Zero Resistance |
| RB | Rechargable Battery |
| RB | Resistance Barrier |
| RB | Rubberized Base |
| RBB | Base Sheet Resistance |
| RBB | Reverse Body Bias |
| RBD | Reliability Block Diagram |
| RBL | Relay Black List |
| RBOC | Rotating Broad Oscillating Coil |
| RBSOA | Reverse Bias Safe Operating Area |
| RBW | Resolution BandWidth |
| RC | Recursive Control |