AAA

1. American Automobile Association[?]
2. Analog/Analog/Analog[?] (audio CD format, recording/mixing/mastering)
3. Anti-Aircraft Artillery[?]
4. Abdominal Aortic Aneurysm[?]
5. Access All Areas[?] (Sony music project)
6. Access Approval Authority[?]
7. Accumulated Adjustments Account[?] (US Federal Income Tax)
8. Aces of ANSI Art[?]
9. Acquisition Approval Authority[?]
10. Action Awareness Alert[?]
11. Adaptive Array Antenna[?]
12. Adjust for ASCII Addition[?] (X86)
13. Administration, Authorization, and Authentication[?] (Software Security)
14. Advanced Acoustic Array[?]
15. AEGIS Acquisition Agent[?]
16. Aerospace Engineering, Applied Mechanics, and Aviation[?]
17. Against All Authority[?] (punk band)
18. Age Anaesthesia Association[?]
19. Agricultural Adjustment Act of 1933
20. Agricultural Adjustment Administration[?]
21. Air Avenue of Approach[?]
22. Airborne Array Aperture[?]
23. Airborne Assault Area[?]
24. Aircraft Alert Area[?]
25. Airport Airspace Analysis[?]
26. Alaska Activities Adventures Plus Tours[?]
27. Album Adult Alternative[?] (radio format)
28. Allocations, Assessments, and Analysis[?]
29. Alternate Assembly Area[?]
30. Amateur Athletics Association[?]
31. American Academy of Actuaries[?]
32. American Academy of Addictionology[?]
33. American Academy of Advertising[?]
34. American Academy of Audiology[?]
35. American Accounting Association[?]
36. American Allergy Association[?]
37. American Ambulance Association[?]
38. American Anthropological Association
39. American Arbitration Association
40. American Armwrestling Association[?]
41. American Association of Anatomists[?]
42. American Audit Associates[?]
43. Anesthesia Administration Assembly[?]
44. Angle Angle Angle[?] (geometric proof)
45. ANSI Artists of America[?]
46. Anti-Acronym Abuse[?]
47. Antiaircraft Antiarmor[?] (Weapon)
48. Anticipative Adaptive Array[?] (frequency-hopping communications)
49. Antique Airplane Association[?]
50. Antique Automobile Association[?]
51. Anygame Anytime Anyplace[?] (gaming clan)
52. AOES (Advanced Orbital Ephemeris System) Accuracy Assessment[?]
53. Appraisers Association of America[?]
54. Area Agency on Aging[?]
55. Arkansas Ambulance Association[?]
56. Army Audit Agency[?]
57. Aromatic Amino Acid[?]
58. Asociacion Anticomunista Argentina[?]
59. Assign Alternate Area[?]
60. Association of Avatar Artists[?]
61. Astronaut-Actuated Abort[?]
62. Athiest and Agnostic Association[?]
63. Attitude, Awareness and Accountability[?] (ski safety program)
64. Australian Association of Accountants[?]
65. Australian Automobile Association[?]
66. Authentication, Authorization and Accounting[?] (Cisco)
67. Authentication, Authorization, and Accounting[?]
68. Authorization Accounting Activity[?]
69. Authorized Accounting Activity[?]
70. Automated Airlift Analysis[?]
71. Autoridad de Acueductos y Alcantarillados[?] (Aqueduct and Sewer Authority, Puerto Rico)
72. Awaiting Aircraft Availability[?]

AAA is also a standard size dry cell battery.