Hiện nay

1. American Chemical Society - also Am Chem Soc
2. Access - also ax$ and A
3. Advanced Camera for Surveys
4. Advanced Computer System
5. American cancer society
6. Asynchronous Communication Server
7. Attitude Control System
8. Access Control System
9. Alternating Current Synchronous
10. Army Community Service
11. Auxiliary cooling system
12. Abdominal compartment syndrome - also AACS
13. Access Control Set
14. Acid Scrubber
15. Acute Coronary Syndrome
16. Adaptive Control System
17. Access Control and Security
18. Access Control Server
19. Active Control System
20. American Ceramic Society - also ACERS and Am Ceram Soc
21. Assistant Chief of Staff - also ACofS, AC/S and ACOS
22. Adenocarcinomas - also ADCAs, ACAs, AC, ADC, AdCs, Ad and ACA
23. Acid synthase - also AHS and AHAS
24. Acetyl-CoA synthetase - also AceCS
25. Acute Coronary Syndromes - also ACSs
26. Advanced communication systems - also ACSY
27. Antenatal corticosteroids - also ANCS
28. Accredited Standards Committee - also ASC
29. Asymptomatic carriers - also ASCs, AC and ASC
30. Automatic Call Sequencer