| Abbreviation | Definition |
|---|---|
| RAS | Rear Axle Steering |
| RAV | Rotary Airlock Valve |
| REDA | Riverview Economic Development Association |
| REVA | Reliable Effective Versatile And Affordable |
| RF | Raised Face |
| RGR | Robust Gaussian regression |
| RMERC | Rock Mechanics and Explosives Research Center |
| RMERC | Rock Mechanics Explosives Research Center |
| RMRE | Rock Mechanics and Rock Engineering |
| RMS | Rated Maximum Sinusoidal |
| RMS | Reloadable Motor System |
| RO | Restrictive Orifice |
| RO/DI | Reverse Osmosis / De-Ionized |
| RPM | Rotations Per Minute |
| RRRV | Rise of Restriking Voltage |
| RUD | Rapid Unplanned Disassembly |
| RWR | Rain Water Riser |
| SAD | Sub Assemble Drwing |
| SB | Spectacle Blind |
| SCAK | Small Circle Accessory Kit |