- BIBD (= balanced incomplete block design)
- BIB design
- bibliography
- BIBO stability
- bicalculable system
- bicanonical
- bi-Cartesian square
- bicategory
- BIC criterion
- bicentered tree
- bicenters
- bicentralizer
- bicentral tree
- bicentric
- bicentric perspective
- bicentric points
- bicentric polygon
- bicentric quadrilateral
- bicentric sum
- bicentric triangle
- bichain
- bicharacteristic curve
- bicharacteristic rays
- bicharacteristics
- bicharacteristic strip