| Acronym | Definition |
|---|
| RIU➣Remote Interface Unit |
| RIU➣Regulatory Impact Unit (United Kingdom) |
| RIU➣Radioactive Iodine Uptake |
| RIU➣Radio Interface Unit |
| RIU➣Refractive Index Unit |
| RIU➣Riverine Interdiction Unit |
| RIU➣Ring Interface Unit |
| RIU➣Radar/Remote Interface Unit |
| RIU➣Remux Interface Unit |