Other
- AAB, refers to acetic acid bacteria, classified under alphaproteobacteria which are used in making vinegar
- Aniline Yellow or aminoazobenzene
- Atlas of Australian Birds, two books and a database of the Royal Australasian Ornithologists Union
- Antigua and Barbuda
- Auto-aggressive behaviour, aka self-harm
- AAB is also used to characterize the structure of verses in blues music. "A" stands for the first verse which is repeated twice and "B" the conclusion. This is also called the call and response structure of the blues.
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