| Abbreviation | Definition |
|---|---|
| RIHD | Rotary Impact Hammer Drills |
| RIHD | Rubber Industry Help Desk |
| RIHR | Registered in Human Relations |
| RIHR | Resampled Instantaneous Heart Rate |
| RII | Radio Islam Indonesia |
| RII | Rebar Installation Instructions |
| RII | Reconfigurable Inverted Index |
| RII | Recording Inclusivity Initiative |
| RII | Recruiters International Inc |
| RII | Red Inmobiliaria Internet |
| RII | Relative Importance Index |
| RII | Relative Index of Inequality |
| RII | Remote Ignition Interrupter |
| RII | Resources And Infrastructure Industry |
| RII | Routing Information Indicator |
| RIIA | Resource Initialization Is Acquisition |
| RIIA | Retirement Income Industry Association |
| RIIA | Royal Institute of International Affairs |
| RIID | radio isotope identification devices |
| RIID | Regional Investigation and Intelligence Division |