Domino
The unique 2-Polyomino consisting of two equal squares connected along a complete Edge.
The Fibonacci Number 
gives the number of ways for 
dominoes to cover a 
Checkerboard, as illustrated in the following diagrams (Dickau).
References
Dickau, R. M. ``Fibonacci Numbers.''http://www.prairienet.org/~pops/fibboard.html. Gardner, M. ``Polyominoes.'' Ch. 13 in The Scientific American Book of Mathematical Puzzles & Diversions. New York: Simon and Schuster, pp. 124-140, 1959. Kraitchik, M. ``Dominoes.'' §12.1.22 in Mathematical Recreations. New York: W. W. Norton, pp. 298-302, 1942. Lei, A. ``Domino.'' http://www.cs.ust.hk/~philipl/omino/domino.html. Madachy, J. S. ``Domino Recreations.'' Madachy's Mathematical Recreations. New York: Dover, pp. 209-219, 1979.
- Breeder
- Brelaz's Heuristic Algorithm
- Brent-Salamin Formula
- Brent's Factorization Method
- Brent's Method
- Bretschneider's Formula
- Brianchon Point
- Brianchon's Theorem
- Brick
- Bride's Chair
- Bridge Card Game
- Bridge (Graph)
- Bridge Index
- Bridge Knot
- Bridge Number
- Bridge of Königsberg
- Brill-Noether Theorem
- Bring-Jerrard Quintic Form
- Bring Quintic Form
- Brioschi Formula
- Briot-Bouquet Equation
- Brocard Angle
- Brocard Axis
- Brocard Circle
- Brocard Diameter