1. Abort To Orbit
2. Air Tasking Order
3. Australian Taxation Office
4. Aircraft Transfer Order
5. Approved Training Organisation
6. Abbreviated Technical Order
7. Air Task Order
8. Air Traffic Organization
9. Airborne Tactical Officer
10. Abort-to-Orbit
11. Agency Tender Official
12. Agro Technologisch Onderzoek
13. Air Target Officer
14. Air To Open
15. Air Tasking Officer
16. Air traffic operations
17. Arsenic trioxide - also arsenite and As
18. Atovaquone - also ATQ
19. At-The-Opening order (Lệnh giao dịch tại mức giá khớp lệnh

xác định giá mở cửa)