| Abbreviation | Definition |
|---|---|
| RPU | Reconfigurable Processing Unit |
| RPU | Redundant Power Unit |
| RRAM | Resistive Random Access Memory |
| RRBD | Really Really Big (disk) Drive |
| RS-232 | Recommended Standard 232 (EIA standard for transmitting serial data) |
| RS-422 | Recommended Standard 422 (ANSI/EIA standard for transmitting serial data) |
| RS-423A | Recommended Standard 423A |
| RS-485 | Recommended Standard 485 |
| RSDL | Reverse Spiral Dual Layer |
| RSFC | Router Switch Feature Card |
| RSIC | Resilient Sound Isolation Clip |
| RSL | Rambus Signaling Level |
| RSPC | Restore Service Processor Configuration |
| RT | Radio Tag |
| RT | Raw Tape |
| RT | Render Time |
| RTA | Real Time Analyzer |
| RTA | Real-Time Accumulator |
| RTAB | Right-handed flip-up TABlet |
| RTAD | Router ADapter |