| Abbreviation | Definition |
|---|---|
| R | Regional |
| R0 | Record zero |
| RA | Rapid Access |
| RA | Restore Advanced |
| RAAM | Recursive Auto Associative Memory |
| RAC | Reliability Analysis Center |
| RACE | Reconfigurable And Adaptive Computing Environment |
| RACF | Resource Access Control Facility |
| RAD | Rapid Application Design |
| RAGE | Radiation Adaptive Grid Eulerian |
| RAGE | Real Arcade Game Emulator |
| RAID | Required Analysis of Image Data |
| RAL | Random Access Linkage |
| RALPH | Robotic Assembly Language Planning Hierarchy |
| RAMAC | Random Access Method of Accounting and Control |
| RAP | Rapid Assessment Program |
| RARP | Reverse Address Resolution Protocol |
| RAS | Random Assorted Stuff |
| RAS | Really Archaic Standard |
| RAS | Reliability Availability And Scalability |