An octagonal pyramid
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It is octagonal prism
An hexagonal cross-section prism has 8 faces, 18 edges and 12 vertices
the shape that has 8 faces , 18 edges , and 12 vertices is simply a hexagonal prism not a pyramid my butt :P
It depends on the exact shape. An octahedron is a shape with eight faces. It can be a heptagonal pyramid (8 vertices, 14 edges), or a hexagonal prism (12 vertices, 18 edges), square dipyramid (6 vertices, 12 edges) are some examples. There are more.
It has 8 faces, 18 edges and 12 vertices