AR

1. .ar,
2. A.R Rahman
3. Abandonia Reloaded
4. Abbey Road
5. Abbey Road Studios
6. Absolute Return + Alpha
7. Accelerated Reader
8. Accelerated Rehabilitation
9. Accounts Receivable
10. Acknowledgement of receipt,
11. Action Replay
12. Activation record
13. Active record pattern
14. Adobe Reader
15. Adrenergic Receptor,
16. Adverse reaction
17. Aerolíneas Argentinas 
18. Air Rivals
19. Alex Rider
20. Alfa Romeo,
21. Alternate reality (disambiguation)
22. American Revolution
23. Analytical Reagent
24. Androgen receptor
25. Animal rights
26. Anti-reflective 
27. Aortic Regurgitation
28. Appenzell Outer Rhodes,
29. Ar (city),
30. ar (Unix)
31. AR-15,
32. Arabic language 
33.  Arad County,
34. Archimedes number
35. Architectural Review
36. Argent
37. Argentina
38. Argentina 
39. Argon
40. Arizona Republic,
41. Arkansas,
42. Arlesdale Railway
43. Armaan and Riddhima
44. Armadillo Run
45. Artificial Respiration
46. Artist and repertoire
47. Arunachal Pradesh,
48. Aryl 
49. Aspect ratio (image)
50. Aspect ratio (wing),
51. Assistant referee (association football)
52. Astronomer Royal
53. Atlantic Records
54. Atomic Weight
55. Augmented reality
56. Autoregressive
57. Autoregressive model,
58. Autosomal Recessive
59. Province of Arezzo,