sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Home Office Country Assessments | ** |
| Head Office Collection Account | ** |
| Hellenic Optimist Class Association | * |
| Home Occupation Class A | * |
| Home Office Communications Advisory | * |
| Haematology Oncology Clinics of Australia | * |
| Headquarters of the Overseas Chinese Association | * |
| Highway One Classic Autos | * |