| Abbreviation | Definition |
|---|---|
| RB | Rocky Blue |
| RBC | Ruby Base Component |
| RBG | Red, Blue, Green |
| RBT | Red, Blue, Tan |
| RBY | Ruby |
| RBZ | Rustic Bronze |
| RCB | Radio Crystal Blue |
| RCT | Red Cream Tortoiseshell |
| RD | Red Diamond |
| RED | Roll, Eyes in, Dark |
| RGB | Range Grade Brightness |
| RGB | Red Green Blue |
| RGB | Red, Green, and Blue |
| RI | Red Inner |
| RJ | Red Jewel |
| RMC | Rainbow Multi-Coated |
| RMC | Removable Mood Color |
| RO | Red Outer |
| ROYG | Red, Orange, Yellow, Green |
| ROYGBIV | Red Orange Yellow Green Blue Indigo Violet |