An hexagonal cross-section prism would fit the given description.
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It is an octahedron that is a 3D shape with 8 faces
octagon
That 3D shape is called triangular pyramid.
A 3D 5 sided shape is called a dodecahedron. It is a solid with 20 vertices, 30 edges and 12 equal pentagonal triangular faces.
tetrahedron