sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Association of Coach Training Organizations | ** |
| Alliance of Concerned Transport Operators | ** |
| Alliance of Transport Operators | ** |
| Atmospheric Chemistry and Transport of Ozone | ** |
| Amazon Cooperation Treaty Organisation | ** |
| Advocacy Centre for Tenants in Ontario | ** |
| Applied Communications Technology Operation | ** |
| Association of Container Train Operators | ** |
| Alliance of Concerned Transportation Operators | ** |
| Amazon Cooperation Treaty Organization | * |
| Association for Coach Training Organizations | * |
| Avis Company Travel Orders | * |
| Air Corps Technical Orders | * |
| Associazione Culturale Trieste O' | * |