sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Pan American Sports Organization | *** |
| Pannonia Allstars Ska Orchestra | *** |
| Pan American Symphony Orchestra | *** |
| Panel Survey of Organisations | *** |
| Performing Arts Symphony Orchestra | *** |
| Pacific Aviation Safety Office | *** |
| Panhandle AIDS Support Organization | *** |
| Panel Survey of Organizations | *** |
| Pan American Sports Organisation | *** |
| Pan African Students Organization | *** |
| Physician Assistant Student Organization | *** |
| Pan African Student Organization | ** |
| Pilipino American Student Organization | ** |
| Pan Africanist Student Organisation | ** |
| Provincial Agricultural Services Office | ** |
| Pan Afrikan Student Organization | ** |
| Plasma Assisted Sludge Oxidation | ** |
| Product Assurance and Safety Office | ** |
| Prosper Area Soccer Organization | ** |
| Pan Africanist Students Organisation | ** |
| Pan American Sanitary Organization | ** |
| Paradigm independent Shop control for Smaller manufacturing Sites | ** |
| Public Administration Student Organization | ** |
| Pan African Students Organisation | ** |
| Performing Arts Student Organization | ** |
| Pre Admission Summer Opportunity | * |
| Petroleum Accountants Society of Oklahoma | * |
| Photographic Art Specialists of Ohio | * |
| Pacific Aviation Safety Organisation | * |
| Parkfield Area Seismic Observatory | * |
| Personal Authentication Standard Organization | * |
| Protein Array Sensor for Organics | * |
| Large-scale Advanced Prototype Software Systems in targeted domains | * |
| Postings About Soap Operas | * |