| Abbreviation | Definition |
|---|---|
| QRN | Quick Response Network |
| QS | Quasi- Synchronous |
| QSIG | Q signaling |
| QTF | Queue To File |
| QTP | Quick Transaction Protocol |
| QUIC | Quick UDP Internet Connections |
| QW | Queue Write |
| R | Reply |
| R2CP | Radial Reception Control Protocol |
| R6 | Rainbow 6 Siege |
| RAC | Real Application Clusters |
| RACE | Real-time Asynchronous Compute Environment |
| RAD | Remote Access Device |
| RADAR | Resource Access Discovery And Retrieval |
| RADIUS | Remote Authentication Dial In User Services |
| RADSL | Rate Adaptive Digital Subscriber Line |
| RAF | Reversed Air Flow |
| RAIL | Random Array of Independent Libraries |
| RAIN | Redundant Array of Independent Networks |
| RAIN | Redundant Array of Inexpensive Nodes |