Initialism of American Atheists Addiction Recovery Groups.

(historical) Initialism of American Association for the Advancement of Slavic Studies, now known as the Association for Slavic, East European, and Eurasian Studies

Initialism of Association of Administrative Assistants and Secretaries to United States Senators.

plural of AAAOC

(military) Initialism of amphibious assault bulk fuel system.

Initialism of Association of American Boards of Examiners in Veterinary Medicine.

American Amateur Baseball Congress / (dated) American Association of Bible Colleges, now known as Association for Biblical Higher Education / Associated Air Balance Council

Initialism of American Association of Botanical Gardens and Arboretums.

Initialism of American Association of Blood Banks.

(computer science, graphics) Initialism of axis aligned bounding box.