| item | description | category | filter | more on... |
| RIU | Radio Interface Unit | Governmental/Military |
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| RIU | Refractive Index Unit | Edu./Physics |
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| RIU | Relay Interface Unit | IT/Hardware |
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| RIU | Remote Interface Unit | Governmental/NASA |
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| RIU | Resource Information Unit | IT/Databases |
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| RIU | Riphah International University | Edu./Universities |
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