hélix
A helix, written hélix in French, is a three-dimensional spiral shape or curve that winds around a central axis while advancing along it. Helices occur in mathematics, biology, and engineering, and they are distinguished by a constant progression along the axis as the curve circles the axis.
Mathematically, a circular helix is the simplest form: a space curve with constant curvature and constant nonzero
Biology features two well-known helices: the protein alpha-helix and the DNA double helix. The alpha-helix is
Other examples include helically wound springs, screws, and many helical nanostructures used in materials science and
Etymology: the term derives from the Greek helix, meaning spiral.