| Academic Counselling Board | Academic & Science |
| Active Chilled Beam | Academic & Science |
| Alternating Current Balancer | Academic & Science |
| A Choose B | Academic & Science |
| Automated Clearing Bureau | Accounts and Finance |
| Association of Certified Book-keepers | Accounts and Finance |
| Bellaire | Airport Code |
| Asia Commercial Bank | Banking |
| Advertising Checking Bureau | Business |
| American Certification Body | Business |
| Advisory Committee on Biologicals | Business |
| Antigua Commercial Bank | Business |
| A-Cap Resources Ltd | Business |
| American Chartered Bank | Business |
| Akiba Commercial Bank | Business |
| Adjusted Cost Base | Business |
| Association for Clinical Biochemistry | Chemistry |
| Association of Concert Bands | Community |
| Association for Community Broadcasting | Community |
| Anonymous Confession Board | Community |
| Assoc for Community Broadcasting | Community |
| Anonymous Conference Board | Community |
| Asociación de Clubes de Baloncesto | Community |
| Academic Challenge Bowl | Community |
| Adobe Color Books | Computing |
| Automatic Color Balance | Computing |
| Automatic Circuit Breaker | Computing |
| Adapter Control Block | Computing |
| Aws Code Build | Computing |
| Access method Control Block | Computing |
| Angular Contact Bearings | Contact |
| Application Control Block | Database Management |
| Air Circuit Breaker | Electronics |
| Graphics (acmb) | File Type |
| Aberdeen City Boundary | General |
| Auto Contrast Balance | General |
| Automatically Controlled Bending | General |
| Advance Confirmed Breakout | General |
| Access Control Block | General |
| Assasins Creed Brotherhood | General |
| Armadillo Christmas Bazaar | General |
| Advanced Communicator Bronze | General |
| Absolute Championship Berkut | General |
| Anticholinergic Cognitive Burden | General |
| Advanced Capability Build | General |
| Annie Costello Brown | General |
| ASEAN Centre for Biodiversity | General |
| Aplication Control Block | General |
| Accelerated Carbonized Biomass | General |
| Analog Clock Booster | General |
| Analog Circuit Behaviour | General |
| Antwerp crafted busts | General |
| Analog Circuit Behavior | General |
| AWS CIS Benchmark | General |
| Al Chest Breach | General |
| Air Circuit Breakers | General |
| American Contemporary Ballet | General |
| Asymptotic Constant Baseline | General |
| Active Controlled Ballast | General |
| Alberta Child Benefit | General |
| Adjusted Cost Basis | General |
| Active Controlled Brake | General |
| Automobile Club Brescia | General |
| Automotive Cluster Bulgaria | General |
| Active Cruise with Braking | General |
| Active City Brake | General |
| Australian Country Buggy | General |
| Ateliers Construction Carrosserie Broual | General |
| Arizona Classic Broncos | General |
| Abarth Club Bavaria | General |
| Accelerator Cable | General |
| Autonomous City Brake | General |
| Automobiel Club Borne | General |
| Amicale Citroen Bordeaux | General |
| Amphicar Club Berlin | General |
| Automovil Club Boliviano | General |
| Automovel Clube Brasileiro | General |
| Amsoil Diesel Cetane Boost | General |
| Automobile Club de la Baule | General |
| Air Conditioned Bus | General |
| Auto Car Brokers | General |
| Auto Crew Builder | General |
| Anti Corruption Bureau | Governmental |
| Annoyance Call Bureau | Governmental |
| Accreditation and Certification Branch | Governmental |
| Arts and Culture Bureau | Governmental |
| Angel City Brigade | Governmental |
| Amy Coney Barrett | Governmental |
| Asian Congress on Biotechnology | International |
| Asociación Cristiana de Beneficencia | International |
| Already Came Bro | Internet |
| Albumin Cobalt Binding | Medical |
| American Council of the Blind | Medical |
| Antibody-Coated Bacteria | Medical |
| Aorto-Coronary Bypass | Medical |
| Arterialised Capillary Blood | Medical |
| Association of Clinical Biochemists | Medical |
| Asymptomatic Carotid Bruit | Medical |
| Annals of Clinical Biochemistry | Medical |
| Alberta Cancer Board | Medical |
| Aryan Coal Benefications | Messaging |
| Army Classification Battery | Military and Defence |
| Air Combat Brigade | Military and Defence |
| Amphibious Construction Battalion | Military and Defence |
| Annular Confinement Beam | Physics Related |
| Australian Classification Board | Regional |
| African Centre for Biosafety | Regional |
| African Centre for Biodiversity | Regional |
| Athletic Club of Bend | Sports |
| Australian Cricket Board | Sports |
| Athletic Club Building | Sports |
| Antrim County Airport | Transport & Travel |
