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.

It is the one-dimensional simplex, the one-dimensional hypercube, and the one-dimensional orthoplex.

Vertex coordinates
Coordinates for 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)