Gyrate Bidiminished Rhombicosidodecahedron
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Johnson Solid 
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- Butterfly Polyiamond
- Butterfly Theorem
- Bäcklund Transformation
- Bézier Curve
- Bézier Spline
- C
- C*
- Cable Knot
- Cactus Fractal
- Cake Cutting
- Cal
- Calabi's Triangle
- Calabi-Yau Space
- Calculus
- Calculus of Variations
- Calcus
- Calderón's Formula
- C*-Algebra
- Caliban Puzzle
- Calvary Cross
- Cameron's Sum-Free Set Constant
- Cancellation
- Cancellation Law
- Cannonball Problem
- Canonical Form