octahedron
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An octahedron: two quadrilateral based pyramids with their bases together.
A triangular prism (like a bar of toblerone).A triangular prism.
Triangular.A pyramid has triangular faces
Triangular Prism
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.