| RADIUS | Remote Authentication Dial-In User Service | - | Human Genome |
| RADSL | Rate-Adaptive Digital Subscriber Line | - | Human Genome |
| RAID | Redundant Array Of Independent Disks | - | Human Genome |
| RAID | Redundant Array Of Inexpensive Disks | - | Human Genome |
| RAM | Random Access Memory | - | Human Genome |
| RAMDAC | Random Access Memory Digital-to-Analog Converter | - | Human Genome |
| RARP | Reverse Address Resolution Protocol | - | Human Genome |
| RAS | Remote Access Services | - | Human Genome |
| RC4 | RC4 Stream Cipher (Rivest Cipher 4) | - | Human Genome |
| RDBMS | Relational Database Management System | - | Human Genome |
| RDF | Resource Description Framework | - | Human Genome |
| RDRAM | Rambus DRAM | - | Human Genome |
| RFC | Request For Comments | - | Human Genome |
| RFI | Radio Frequency Interference | - | Human Genome |
| RFID | Radio Frequency Identification | - | Human Genome |
| RFP | Request For Proposal | - | Human Genome |
| RGB | Red Green Blue | - | Human Genome |
| RIP | Raster Image Processor | - | Human Genome |
| RIP | Regulation Of Investigatory Powers Act | - | Human Genome |
| RISC | Reduced Instruction-Set Computing | - | Human Genome |
| RJ-11 | Registered Jack-11 | - | Human Genome |
| RJ-45 | Registered Jack-45 | - | Human Genome |
| RLL | Run Length Limited | - | Human Genome |
| RMB | Right Mouse Button | - | Human Genome |
| RMON | Remote Monitoring | - | Human Genome |
| RMTP | Reliable Multicast Transport Protocol | - | Human Genome |
| ROFL | Rolling On Floor, Laughing | - | Human Genome |
| ROM | Read-Only Memory | - | Human Genome |
| RPG | Report Program Generator | - | Human Genome |
| RPG | Role-Playing Game | - | Human Genome |
| RPM | Revolutions Per Minute | - | Human Genome |
| RSN | Real Soon Now | - | Human Genome |
| RSVP | Resource Reservation Setup Protocol | - | Human Genome |
| RTF | Rich Text Format | - | Human Genome |
| RTFM | Read The F*cking Manual | - | Human Genome |
| RTSP | Realtime Streaming Protocol | - | Human Genome |
| RTT | Round-trip Time | - | Human Genome |
| RA | Registration Authority
| - | Human Genome |
| RAMP | radio access mail protocol
| - | Human Genome |
| RAPID | restoration and provisioning integrated design
| - | Human Genome |
| RBGAN | regional broadband global area network
| - | Human Genome |
| RCS | routing control system
| - | Human Genome |
| RD | Requirements Development
| - | Human Genome |
| RD-LAP | radio data-link access protocol
| - | Human Genome |
| RDC | Regional Data Center
| - | Human Genome |
| RDR-A | remote data replication for archiving
| - | Human Genome |
| RDR-M | remote data replication for mirroring
| - | Human Genome |
| RESP | ORG responsible organization
| - | Human Genome |
| RF | radio frequency
| - | Human Genome |
| RI | reporting interval
| - | Human Genome |
| RM | Requirements Management
| - | Human Genome |
| RMP | risk management process
| - | Human Genome |
| RNC | restoration node controller
| - | Human Genome |
| ROE | right of entry
| - | Human Genome |
| ROW | rest of world
| - | Human Genome |
| RPH | resource priority header
| - | Human Genome |
| RPI | routing pattern index
| - | Human Genome |
| RPR | resilient packet ring
| - | Human Genome |
| RRAP | repetitive routing attempt procedure
| - | Human Genome |
| RSA | Risk/Security Assessment
| - | Human Genome |
| RT | route target
| - | Human Genome |
| RTAP | real-time attack prevention
| - | Human Genome |
| RTCP | real-time transport control protocol
| - | Human Genome |
| RTM | Requirements Traceability Matrix
| - | Human Genome |
| RTNR | real-time network routing
| - | Human Genome |
| RTO | recovery time objectives
| - | Human Genome |
| RTP | real-time protocol
| - | Human Genome |
| RUBY | rule building capability
| - | Human Genome |
