| item | description | category | filter | more on... |
| OBU | Kobuk, Alaska USA | Regional/Airport Codes |
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| OBU | Offshore Banking Unit | Business/General |
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| OBU | Oklahoma Baptist University | Edu./Universities |
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| OBU | On Board Unit | Governmental/NASA |
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| OBU | One Big Union | Business/General |
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| OBU | OSIS Baseline Upgrade | Governmental/Military |
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| OBU | OSIS Baseline Upgrade | Edu./Ocean Science |
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| OBU | Ouachita Baptist University | Edu./Universities |
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| OBU | Overseas Business Unit | Uncategorized |
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