| o+ | Blood type |
|---|
| o | Barack Obama Blood type Mandan Oliver Cromwell Orca Ordinal number Organic chemistry Osama bin Laden Oxygen Pelé Portugal Soil horizon The Count of Monte Cristo Uzbekistan |
|---|
| o1 | Comet Hale-Bopp |
|---|
| o₂ | Oxygen |
|---|
| o₃ | Ozone |
|---|
| ό | Greek alphabet |
|---|
| ω | Omega-3 fatty acid Ordinal number |
|---|
| ώ | Greek alphabet |
|---|
| ω−3 | Omega-3 fatty acid |
|---|