| Abbreviation | Definition |
|---|---|
| OVT | Okolona Vocational Technical School |
| OWHS | Orangeburg Wilkinson High School |
| OWHS | Orangeburg-Wilkinson High School |
| OWHS | Oshkosh West High School |
| OWPS | Orton Wistow Primary School |
| OWS | Open Window School |
| OWU | Out With Uniforms |
| OXAC | Oxford Academy and Central |
| OYIS | Osaka YMCA International School |
| p. | pupil |
| PA | Parents' Association |
| PABS | Peninsula Anglican Boys School |
| PAC | Passing All Classes |
| PACE | Parents As Career Educators |
| PACE | Program Adult College Education |
| PACS | Palo Alto Chinese School |
| PACSA | Paret Advisory Committee on Student Achievement |
| PAES | Portland Adventist Elementary School |
| PAHF | play and have fun |
| PAHS | Perth Amboy High School |