The curvature and torsion: how to distinguish the shape of a curve 
Still curvature and torsion
Note that the example herein presented is not unique. Indeed, keeping the curvature and torsion functions, whenever one chooses two distinct Frenet-Serret frames at a given instant, the corresponding curves will be different. In the given apps, the Frenet-Serret frame considered in \(180º\) is exactly the same as the Frenet-Serret frame considered in \(-180º\) (because the rotations with angles \(180º\) and \(-180º\) are equivalent).
