The question is not clear.
Hardest, as in the most rigid, is a triangular prism (or tetrahedron).
Hardest, to work the geometry of, is probably an irregular blob.
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Many 3d shapes have a corner.
A 12 sided 3D shape is a dodecahedron.
A tridekahedron is a 3D 30 sided shape.
A 3D shape that has 6 edges is called a hexagonal prism.
it is a strong inadiquate word that describes a 3d shape. A tetrahedron.