| Acronym | Definitions |
|---|---|
| RHT | 4 |
| RHUBARB | 2 |
| RI | 38 |
| RI/BRA | 1 |
| RI/FS | 1 |
| RI/RA | 1 |
| RIA | 22 |
| RIACS | 1 |
| RIAS | 2 |
| RIB | 9 |
| RIBE | 2 |
| RIBS | 3 |
| RIC | 19 |
| RICA | 2 |
| RICC | 2 |
| RICE | 2 |
| RICHS | 1 |
| RICO | 4 |
| RICS | 2 |
| RID | 14 |
| RIDA | 2 |
| RIDGE | 2 |
| RIDS | 6 |
| RIE | 4 |
| RIF | 13 |
| RIFF | 2 |
| RIfS | 1 |
| RIFT | 2 |
| RIG | 4 |
| RIGS | 1 |
(511 — 540 of 1025)