Tetrahedroid
Irreducible nodal surface with properties similar to that of a tetrahedron / From Wikipedia, the free encyclopedia
Not to be confused with tetrahedron.
In algebraic geometry, a tetrahedroid (or tétraédroïde) is a special kind of Kummer surface studied by Cayley (1846), with the property that the intersections with the faces of a fixed tetrahedron are given by two conics intersecting in four nodes. Tetrahedroids generalize Fresnel's wave surface.