The Boerdijk–Coxeter helix, named after H. S. M. Coxeter and Arie Hendrick Boerdijk, is a linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices. There are two chiral forms, with either right-handed or left-handed windings. Unlike any other stacking of...
