| Meaning | Category |
| EPOC RESource Source File | Computing->File Extensions |
| RDF Site Summary | Computing->Software |
| Radio Service Software | Computing->Telecom |
| Rail Security Service | Governmental->Transportation |
| Rail Surveillance Service | Governmental->Transportation |
| Random Shot Script | Internet |
| Range Safety Switch | Governmental->NASA |
| Range Safety System | Governmental->NASA |
| Rashtriya Swayamsevak Sangh | Governmental->Politics |
| Reactants Supply System | Governmental->NASA |
| Ready For Selfless Service | Governmental->Military |
| Real Sailor Senshi | Community->Performing Arts |
| Real Simple Syndication | Community->Media |
| Real Slim Shady | Miscellaneous->Funnies |
| Really Safe Solution | Governmental->Transportation |
| Really Simple Sniptools | Computing->Software |
| Really Simple Syndication | Internet Community->Media |
| Really Simplified Stuff | Internet->Chat |
| Really Stupid Stuff | Internet->Chat |
| Receive - Side Scaling | Computing->Drivers |
| Red Sound Systems | Business->Firms |
| Reduced Space Symbology | Computing->General |
| Regression Sum of Squares | Academic & Science->Mathematics Academic & Science->Physics |
| Religious Studies Society | Community->Religion |
| Remote Sensing Science | Academic & Science->Ocean Science |
| Remote Site Subsystem | Governmental->Military |
| Remote Slave Station | Governmental->Military |
| Remote Support Software | Computing->Networking |
| Remote Switching Sites | Computing->Telecom |
| Remote Switching System | Computing->Telecom |
| Resident Set Size | Academic & Science->Mathematics |
| Revised Statutes of Saskatchewan | Community->Law |
| Rib Structure Station | Governmental->NASA |
| Rich Site Specification | Internet->Chat |
| Rich Site Summary | Internet |
| Roach Support System | Miscellaneous->Funnies |
| Robotic Servicer System | Governmental->NASA |
| Rockdale Sandow and Southern Railroad Company | Regional->Railroads |
| Room Scheduling System | Academic & Science->Universities |
| Root Sum Square | Academic & Science->Mathematics Governmental->NASA |
| Roseires, Sudan | Regional->Airport Codes |
| Rotating Service Structure | Governmental->NASA |
| Routers, Servers, and Switches | Computing->Networking |
| Rumour Super Service | Internet->Chat |
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