What does AA. stand for?

What does AA. mean?

AA	Automatic Analyzer Business » Products
AA	Amyloid Associated Medical » Human Genome
AA	Avenue of Approach Governmental » Military
AA	AMD Athlon processor Computing » Hardware
AA	Awful Awful Miscellaneous » Funnies
AA	Adjustable Arms Business » Products
AA	Auto Aperture Miscellaneous » Photography
AA	Awaiting Activation Computing » Security
AA	Anti Apostle Community » Religion
AA	Audio Animatronics Academic & Science » Electronics
AA	American Arrogance Miscellaneous » Funnies
AA	Armored Assault Governmental » Military
AA	Armor Attachment Governmental » Military
AA	Addictions Anonymous Community » Non-Profit Organizations
AA	AMD Assured Computing » Hardware
AA	Average Audience Community » Media
AA	Attack Assessment Governmental » Military
AA	ArchAngel Community » Religion
AA	Anesthesiologist Assistant Business » Positions
AA	Atlantic Alliance Governmental » US Government
AA	Aquele Abraco Regional
AA	Adult Accompaniment Community » Music
AA	Accreditation Authority Governmental » Military
AA	Advanced Auditing Academic & Science » Universities
AA	Alternate Advancement Community » Educational