sort by Rank | Alpha
| Possible Meanings | Rank |
| Asia Pacific Trade Council | **** |
| Appointment Promotion and Tenure Committee | **** |
| Applied to the Chamber | **** |
| Alaska Power Telephone Co | *** |
| Australia Pacific Technical College | *** |
| And Peoples of the Caribbean | *** |
| Advanced Personal Trainer Certification | *** |
| Ascension Parish Tourist Commission | *** |
| Asia Pacific Travel Catering | *** |
| Asia Pacific Training Centre | *** |
| AutoDesk Premier Training Center | *** |
| Asia Pacific Training Center | *** |
| Asia Pacific Technology Center | *** |
| Advanced Platform Technology Center | *** |
| Anonymous Publicly Traded Company | *** |
| Australian Postharvest Technical Conference | *** |
| Atlantic Provinces Telecommunications Council | *** |
| Asia Pacific Technical Centre | *** |
| Advanced Personal Training Certification | *** |
| Automatic Paper Thickness Control | *** |
| Anxiety Phobia Treatment Center | *** |
| All Pacific Travel Concept | *** |
| Army Physical Training Corps | *** |
| action-potential tuning curves | ** |
| Asian Petrochemicals Technology Conference | ** |
| Atlantic Petroleum Training College | ** |
| Asia Pacific Transport Consortium | ** |
| Anglo Portuguese Telephone Company | ** |
| Administration Police Training College | ** |
| Advanced Property Tax Compliance | ** |
| Algebra Project Transition Curriculum | ** |
| Aviation Personnel Training Center | ** |
| Appraised Production to Count | ** |
| Ambient Pressure Thermal Cycling | ** |
| American Property Tax Council | ** |
| Admin Professional Technical and Clerical | ** |
| Advanced Propulsion Technology Center | ** |
| Armed Police Training Center | ** |
| Adaptive Plasma Technology Corporation | ** |
| Administrative Professional Technical and Clerical | ** |
| Allow Partially Trusted Callers | ** |
| Association of Parents Teachers and Counselors | ** |
| Allied Printing Trades Council | ** |
| Advanced Physical Therapy Concepts | * |
| Akron Polymer Training Center | * |
| Alamo Public Telecommunications Council | * |
| Armed Police Training College | * |
| Axminster Power Tool Centre | * |
| Analog PSTN Trunk Circuit | * |
| Associazione Produttori Tegole in Cemento | * |
| Audiovisual Professional Training Centre | * |
| Adjustment of Paper Thickness Control | * |
| Advanced Protein Technology Centre | * |
| Anti Platelet Trialists Collaborative | * |
| Apple Publishing Technology Centre | * |
| Academic and Professional Training Committee | * |
| Adaptive Power Topology Control | * |
| Advanced Pain Treatment Centers | * |
| Arizona Puma Track Club | * |
| Asia Pacific Transport Corporation | * |