Your abbreviation search returned 27 meanings
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| Rank Abbr. | Meaning | |
|---|---|---|
| OO | Peroxide (functional group) | |
| OO | Object Oriented (Programming) | |
| OO | Olive Oil | |
| OO | Over and Out | |
| OO | On Order | |
| OO | Ozzy Osbourne | |
| OO | OpenOffice | |
| O-O | Owner Operator (trucking industry; also seen as O/O) | |
| OO | Obiettivi Operativi | |
| OO | Oval Office | |
| OO | Owner Operator (trucking industry; also seen as O/O) | |
| OO | Operations Officer | |
| OO | Owner-Occupied (real estate) | |
| O-O | Kingside Castle (chess notation) | |
| OO | Sky West Airlines | |
| OO | Official Observer (amateur radio) | |
| OO | Optimum Online | |
| OO | Original Oratory | |
| OO | Officers Only | |
| OO | Ombudsman's Office | |
| OO | Onderling Onafhankelijk (Dutch) | |
| OO | Osteoid Osteoma | |
| OO | Ordering Officer | |
| OO | Optimistic Orators (Toastmasters Club) | |
| OO | Operator Office (trunks) | |
| OO | Ophthalmic Optician | |
| OO | Old Oakhamian | |
Note: We have 13 other definitions for O-O in our Acronym Attic