Unit Square
A Square with side lengths 1. The unit square usually means the one with coordinates (0, 0), (1, 0), (1, 1), (0,1) in the real plane, or 0, 1, 
, and 
in the Complex Plane.
- Bairstow's Method
- Baker's Dozen
- Baker's Map
- Balanced ANOVA
- Balanced Incomplete Block Design
- B*-Algebra
- Ball
- Ballantine
- Ballieu's Theorem
- Ballot Problem
- Ball Triangle Picking
- Banach Algebra
- Banach Fixed Point Theorem
- Banach-Hausdorff-Tarski Paradox
- Banach Measure
- Banach Space
- Banach-Steinhaus Theorem
- Banach-Tarski Paradox
- Bang's Theorem
- Bankoff Circle
- Banzhaf Power Index
- Barber Paradox
- Barbier's Theorem
- Bare Angle Center
- Bar (Edge)