| Abbreviation | Definition |
|---|---|
| RO | Reviewed Original |
| RO | Riddle Obsessed |
| RO | Right On |
| RO | Rising Order |
| RO | risk on |
| RO | Rita Ora |
| RO | RO or |
| RO | Romance O |
| RO | Roof Open |
| RO | Room Only |
| RO | Royal Oak |
| RO | Rubery Owen |
| RO | Run on |
| RO | rust and oxidation |
| ROA | Radio Orphan Annie |
| ROA | Raman Optical Activity |
| ROA | Reality of Aid |
| ROA | Realm Of Anime |
| ROA | Recognized Operating Agency |
| ROA | Record on Appeal |