Tetrahedron
What is the tetrahedron?
The tetrahedron (or triangular pyramid) is one of the 5 regular polyhedra. It has the following properties:
Vertex figure: 3.3.3
Faces: 4
Edges: 6
Vertices: 4
Characteristic: 2
More information can be found here: https://en.wikipedia.org/wiki/Tetrahedron