| Ra is for radiophoto. |
| Rb is for rbi. |
| Rc is for rcmp. |
| Re is for red coral and reconnoitre. |
| Rf is for rf. |
| Rh is for rhexia and rhus copallina. |
| Ri is for rima respiratoria and right hand. |
| Rn is for rnase. |
| Ro is for romanesque architecture, rosebud cherry and road hog. |
| Rp is for rpa-abb. |
| Rt is for rtlt. |
| Ru is for rule of cy pres, rum-blossom and rugged. |
| Rv is for rv. |
| Rw is for rwandese republic. |
| Ry is for rydberg unit, rydberg unit and ryukyuan. |
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