| item | description | category | filter | more on... |
| OPO | Object file (Psion OPL) | IT/File Extensions |
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| OPO | Object file (Psion OPL) | IT/File Extensions |
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| OPO | Office Products Outlet | Business/Firms |
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| OPO | Old Post Office | Governmental/FBI |
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| OPO | Operational Performance Objective | Governmental/Military |
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| OPO | Optical Parametric Oscillator | Edu./Physics |
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| OPO | Orbiter Project(s) Office | Governmental/NASA |
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| OPO | Order Pizza for Operator | IT/Assembly |
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| OPO | Ovamboland People's Organization | Regional/African |
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| OPO | Overly Pissed Off | Uncategorized |
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| OPO | Owen, Patterson, & Owen | Business/Firms |
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| OPO | Porto, Portugal | Regional/Airport Codes |
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