| Abbreviation | Definition |
|---|---|
| RSL | Received Signal Level |
| RSP | Remote Set Point |
| RSQ | Real Sound Quality |
| RSS | Really Simple Syndication |
| RST | Radio Systems Technology |
| RST | Regulation Servo Tracking |
| RST | Reynolds Stress |
| RSU | Radio Shack Unlimited |
| RSU | Rate Sensor Unit |
| RSVC | Reactive Supply and Voltage Control |
| RSVC | Relocatable Static VAR Compensator |
| RT | Radio Telephone |
| RT | RISC Technology |
| RTA | Rapid Thermal Anneal |
| RTA | Real-Time Analyzer |
| RTB | Real-Time Backplane |
| RTBT | Resonant Tunneling Bipolar Transistor |
| RTC | Real-Time Control |
| RTCC | Remote Tap Change Circuit |
| RTCVD | Rapid Thermal Chemical Vapor Deposition |