Elongated Pentagonal Cupola
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Johnson Solid 
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- Cubic Equation
- Cubic Number
- Cubic Reciprocity Theorem
- Cubic Spline
- Cubic Surface
- Cubicuboctahedron
- Cubique d'Agnesi
- Cubitruncated Cuboctahedron
- Cuboctahedron
- Cuboctatruncated Cuboctahedron
- Cubocycloid
- Cubohemioctahedron
- Cuboid
- Cullen Number
- Cumulant
- Cumulant-Generating Function
- Cumulative Distribution Function
- Cundy and Rollett's Egg
- Cunningham Chain
- Cunningham Function
- Cunningham Number
- Cunningham Project
- Cupola
- Cupolarotunda
- Curl