| Abbreviation | Definition |
|---|---|
| RH | Roller Head |
| RH | Round Headlight |
| RH | Rubber Hood |
| RH | Running Head |
| RHF | Rotary Hearth Furnace |
| RHH | Radiant Hydronic Heating |
| RHJ | Round Hole Jack |
| RHMJ | Round Hole Metal Jack |
| RHPJ | Round Hole Panel Jack |
| RHS | Rolled Hollow Section |
| RIAB | Radio In A Box |
| RIB | Relay-In-Box |
| RIBB | Ribbon |
| RIBN | Ribbon |
| RIBR | Ribbon, Beet Red color |
| RIC | Rod In Cylinder |
| RIL | RIgoletto Londonaire cigar |
| RINM | RIbbon, NutMeg color |
| RIO | Reverse Implement Option |
| RIO | Reverse Implementation Option |