In a regular constant-torsion polygon,
all edges have the same length,
all angles between adjacent edges are the same,
and all torsion angles (dihedral angles between adjacent angle-spanning planes) are the same in absolute value.
This regular constant-torsion polygon has 10 vertices and edges,
and is self-intersecting.
All angles between adjacent edges are 112.456 degrees,
and all torsion angles are 90 degrees (in absolute value).
The signs of the torsion angles are given in the title.
Designed by Koos Verhoeff.