ABO
ABO most often identifies the major blood‑type classification system, but the acronym also appears in the names of several American professional boards in opticianry, ophthalmology and orthodontics.
Medical
Miscellaneous
Algal Biomass Organization
Algae Biomass Organization
American Beard of Opticianry
Archive Backup Online
Aviators Breathing Oxygen
Community
Governmental
Army Budget Office
Agent of Biological Origin
Air Base Operability
Blood types A, B, and O Blood Typing System
Authorities Budget Office