| Ra is for rational motive and ragsorter's disease. |
| Rb is for rbi. |
| Rc is for rcmp. |
| Re is for reliquary. |
| Rf is for rf. |
| Rh is for rhus typhina and rhetorical. |
| Ri is for richard coeur de lion. |
| Rn is for rna. |
| Ro is for roald amundsen, rockers and rontgen. |
| Rp is for rpa-abb. |
| Rt is for rtlt. |
| Ru is for rusk, rue and rubus cissoides. |
| Rv is for rv. |
| Rw is for rwanda franc. |
| Ry is for rydberg unit, ryukyu islands and rye ergot. |
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