Hadwiger's Principal Theorem
The Vectors 
, ..., 
in a 3-space form a normalized Eutactic StarIff 
for all 
in the 3-space.
- 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
- Curlicue Fractal
- Curl Theorem
- Current