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| OOHH | Out Of Hours Healthcare | |
| OOHH | Out Of Hours Healthcare | |
| OOHM | Out Of Home Media | |
| OOHS | Our Own High School | |
| OOHS | Olentangy Orange High School (Lewis Center, OH) | |
| OOHS | Oregon Office of Homeland Security | |
| OOHS | Oregon Outback Humane Society (Lakeview, OR) | |
| OOHS | Ontario Occupational Health and Safety | |
| OOHU | Object-Oriented Hand Use | |
| OOHU | Object-Oriented Hand Use | |
| OOHU | Object-Oriented Hand Use | |
| OOHU | Object-Oriented Hand Use | |
| OOHVA | Oregon Off Highway Vehicle Association | |
| OOI | Organize, Observe, Instruct | |
| OOI | Ohio Online, Inc. | |
| OOI | Ohio Online, Inc. | |
| OOI | Open Object, Inc. | |
| OOI | Ocean Observatories Initiative | |
| OOI | Object Oriented Interface | |
| OOI | Other Operating Income | |
| OOI | Out of Interest | |
| OOI | Out Of Image | |
| OOI | Objects of Interest | |
| OOI | Object Oriented Interface | |
| OOI | Out Of Interest |
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