| Abbreviation | Definition |
|---|---|
| RAX | Remote Access Computing System |
| RAX | Remote Access Terminal |
| RAZ | Read as Zero |
| RB | Read Binary |
| RB | Rotate Buffer |
| RB | Reservation Bit |
| RBA | Relative Byte Address |
| RBA | Radar Beacon Antenna |
| RBC | Reduced Block Command |
| RBC | Red Blood Count |
| RBC | Red Blood Cells |
| RBC | Rotating Beam Ceilometer |
| RBC | Rotating Biological Contactor |
| RBD | Reliability Block Diagram |
| RBD | Registration of Births and Deaths |
| RBDE | Radar Bright Display Equipment |
| RBE | Radiation Biological Effectiveness |
| RBG | Rocket Boosted Glider |
| RBI | Reserve Bank of India |
| RBI | Reserve Bank of India |
| RBL | Reasonable Benefit Limit |
| RBL | Right Buttock Line |
| RBL | Realtime Blackhole List |
| RBMT | Retrospective Bibliographies on Magnetic Tape |
| RBR | Rotate Bits Randomly |
| RBSN | Regional Basic Synoptic Networks |
| RBSV | Recreational Boating Safety Visitor |
| RBTS | Reed Bed Treatment System |
| RC | Run Command |
| RC | Return Code |
| RC | Run Commands |
| RC | Right Check |
| RC | Region Commissioner |
| RCA | Radio Corporation of America |
| RCA | Resident Computer Assistant |
| RCA | Right Coronary Artery |
| RCAG | Remote Center Air-Ground |
| RCAG | Remote Control Air-Ground |
| RCB | Remote Circuit Breaker |
| RCC | Reinforced Concrete Cement |
| RCC | Renal Cell Carcinoma |
| RCC | Resident Computer Consultant |
| RCC | Range Commanders Council |
| RCC | Range Control Center |
| RCC | Reinforced Carbon-Carbon |
| RCC | Reusable Carbon-Carbon |
| RCC | Rough Combustion Cutoff |
| RCC | Regional Climate Centre |
| RCCA | Rough Combustion Cutoff Assembly |
| RCCB | Remote Control Circuit Breaker |