Gyroelongated Square Cupola
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Johnson Solid 
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- Coordinate System
- Coordination Number
- Copeland-Erdös Constant
- Coplanar
- Coprime
- Copson-de Bruijn Constant
- Copson's Inequality
- Copula
- Cork Plug
- Corkscrew Surface
- Cornish-Fisher Asymptotic Expansion
- Cornucopia
- Cornu Spiral
- Corollary
- Corona (Polyhedron)
- Corona (Tiling)
- Correlation
- Correlation Coefficient
- Correlation Coefficient--Gaussian Bivariate Distribution
- Correlation Dimension
- Correlation Exponent
- Correlation (Geometric)
- Correlation Index
- Correlation Integral
- Correlation Ratio