Tetra Pak was founded by Ruben Rausing and built on Erik Wallenberg’s innovation, namely a tetrahedron-shaped plastic-coated paper carton, from which the company name was derived

    In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces.