| item | description | category | filter | more on... |
| ORP | Objective Rally Point | Governmental/Military |
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| ORP | OFS Retransmission Processor | Governmental/NASA |
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| ORP | Okret Rzeczypospolitej Polskiej | Governmental/Military |
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| ORP | Open Role Playing | Radio Stations |
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| ORP | Open Runtime Platform | IT/Hardware |
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| ORP | Optimum Recording Power | Edu./Electronics |
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| ORP | Our Rare Pairings | Radio Stations |
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| ORP | Oxidation Reduction Potential | Edu./Chemistry |
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