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| RTSPC | RTT | RTTAS | RTTI | RTTR | RTTY |
| RTU | RTV | RTW | RTY | RTZ | RU |
| RUB | RUBP | RUC | RUCST | RUF | RUGGIERO |
| RUH | RUL | RULA | RUM | RUNX1 | RUNX2 |
| RUNX3 | RUO | RUPP | RUQ | RUSH | RUSQ |
| RUST | RUT | RUV | RUW | RV | RVA |
| RVC | RVCC | RVD | RVDS | RVE | RVI |
| RVM | RVO | RVOC | RVP | RVQ | RVR |
| RVSP | RVST | RVT | RW | RWA | RWB |
| RWC | RWH | RWI | RWIS | RWJ | RWK |
| RWL | RWO | RWOH | RWP | RWQ | RWR |
| RWS | RWT | RWU | RWUSL | RWV | RWVL |
| RWZ | Rx | RXA | RXB | RXD | RXF |
| RXI | RXO | RXS | RXT | RXU | RXV |
| RYI | RYN | RYP | RYR | RZ | RZA |
| RZB | RZD | RZG | RZI | RZR | RZT |
| RZX | S?? | S/A | S Afr Med J | S/D | S&H |