A bipyramid is another term for a dipyramid, any of a group of solids formed by two pyramids placed symmetrically base-to-base.
octahedron is a regular square bipyramid but a square bipyramid can be non-regular
Here are some, with number of triangular faces in brackets:tetrahedron (4)triangular bipyramid (6)octahedron (8)pentagonal bipyramid (10)snub disphenoid (12)triaugmented triangular prism (14)gyroelongated square bipyramid (16).There is also a 24 faced stellation for an octahedron.Here are some, with number of triangular faces in brackets:tetrahedron (4)triangular bipyramid (6)octahedron (8)pentagonal bipyramid (10)snub disphenoid (12)triaugmented triangular prism (14)gyroelongated square bipyramid (16).There is also a 24 faced stellation for an octahedron.Here are some, with number of triangular faces in brackets:tetrahedron (4)triangular bipyramid (6)octahedron (8)pentagonal bipyramid (10)snub disphenoid (12)triaugmented triangular prism (14)gyroelongated square bipyramid (16).There is also a 24 faced stellation for an octahedron.Here are some, with number of triangular faces in brackets:tetrahedron (4)triangular bipyramid (6)octahedron (8)pentagonal bipyramid (10)snub disphenoid (12)triaugmented triangular prism (14)gyroelongated square bipyramid (16).There is also a 24 faced stellation for an octahedron.
trigonal bipyramid
It could be a bipyramid.
The official, mathematical word for 2 pyramids attached together is a bipyramid. It is called a bipyramid because -bi means 2, and bi-pyramid means 2 pyramids.
It is a hexahedron: more specifically, a triangular bipyramid.
A square dipyramid (bipyramid) has 6 vertices.
A triangular bipyramid.
A cube. Or a triangular bipyramid.
A trigonal bipyramid has a central atom surrounded by five atoms or groups of atoms, with three of them forming a triangular base and the other two located above and below the plane of the base. This shape resembles two pyramids joined at their bases.
A tetrahedron (4 faces) or triangular bipyramid (5 faces).
A hexahedron in the form of a triangular bipyramid: two triangular pyramids stuck together.