Boerdijk–Coxeter helix
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The Boerdijk-Coxeter helix is a linear stacking of regular tetrahedra. Contrary to any other stacking of platonic solids, the Boerdijk-Coxeter helix is not repetitive. Even in an infinite string of stacked tetrahedra, no 2 tetrahedra will have the same rotation.
The Boerdijk-Coxeter helix is named after H. S. M. Coxeter and A. H. Boerdijk.