Dyad

The dyad, ditelon, dion or simply line segment, is the only possible polytelon. Its facets are two points. It appears as the edges of all higher polytopes.

Vertex coordinates
The vertices of a line segment of length 1 are simply the points:
 * (±1/2).

Representations
The dyad has two distinct representations:


 * x (full symmetry, vertices are the same)
 * oo&#x (vertices considered of different types)