敬意を表して Respect for the tetrahedron
Among all polyhedrons made up of regular polygons, the regular tetrahedron has the smallest number of faces and edges. Many crystals have tetrahedral gaps, and ice, diamonds, and rocks in the earth's crust have molecular structures of regular tetrahedrons. In homage to the regular tetrahedrons of rocks in the earth's crust, which are strong enough to support the earth,