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In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.It is a 3-dimensional cross polytope (shape).---Wikipedia
It is a tetrahedron pyramid
A tetrahedron
The Platonic solid known as an octahedron would fit the given description
Equilateral triangles, squares, regular pentagons.