Tetrahedrons are 4-sided solids. A regular tetrahedron is the equilateral pyramid, having one pyramid as the base and three others the sides.
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polymorphs
More like two tetrahedrons stuck together.
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
Tetrahedrons. The patented drinks container 'Tetra Pak' is this shape. See 'Related Links' below.