Jackson
- Cross Polytope
- Euler Line
- Fuhrmann Circle
- GEOS Circle
- Gergonne Line
- Incenter
- Injection
- Inner Soddy Circle
- Johnson Circles
- Johnson Circumconic
- Johnson's Theorem
- Johnson Triangle
- Johnson-Yff Circles
- Kernel
- Medial Triangle
- Orthic Axis
- Orthocenter
- Orthocentroidal Circle
- Outer Soddy Circle
- Rank-Nullity Theorem
- Regular Tetrahedron
- Simson Line
- Soddy Line
- Spherical Excess