| Abbreviation | Definition |
|---|---|
| RRLH | Regional Research Laboratory Herbarium |
| RRN | Relative Record Number |
| RRP | Recurrent Respiratory Papillomatosis |
| RRT-PCR | real-time reverse transcriptionpolymerase chain reaction (rRT-PCR) |
| RRT-PCR | real-time reverse transcription–polymerase chain reaction (rRT-PCR) |
| RSA | Rapid Slide Agglutination |
| RSA | Regular Spiking Activity |
| RSB | Regulator Of Sigma B |
| RSEL | Radiological Science and Engineering Laboratory |
| RSL | Radiological Sciences Laboratory |
| RSL | RadioScaphoLunate |
| RSM | Regulator of Secondary Metabolites |
| RSSL | Remote Sensing and Spectroscopy Laboratory |
| RSTL | Regional Services and Testing Laboratory |
| RSTL | Regional Standards and Testing Laboratories |
| RSTL | Regional Standards and Testing Laboratory |
| RSTL | Regional Standards Testing Laboratory |
| RSTL | Rough Set Technology Laboratory |
| RSV | Research and Supply Vessel |
| RSX | Rydin Smooth X |