What does A.B. stand for?

What does A.B. mean?

AB	Algemeen Bestuur International
AB	azobenzene International » German
AB	Aerobic Bacteria Medical » Laboratory
AB	Apple Blossom Academic & Science » Botany
AB	American Baptist Community » Religion
AB	Answer Back Governmental » Military
AB	Annie Besant Community » Famous
AB	American Breakfast Miscellaneous » Food
AB	Acid Bath Academic & Science » Chemistry
AB	American Bandstand Community » Media
AB	Associated Board Community
AB	Accreditation Body Academic & Science » Universities
AB	Apache Bench Computing » Networking
AB	Apache Benchmark Computing » Security
AB	Artificial Breeding Medical » Veterinary
AB	After the Bomb Governmental » Military
AB	Allan Border Community » Famous
AB	Activities Building Academic & Science » Universities
AB	Application Bulletin Computing » General
AB	Augusta Bell Business » Firms
AB	Avatars Banners Business » Firms
AB	Aceptación Bancaria International » Mexican
AB	Air Bike Community » Sports
AB	Active Bridge Academic & Science » Electronics
AB	Automatic Balancing Academic & Science » Electronics