A heptahedron (plural: heptahedra) is a polyhedron having seven sides, or faces . A heptahedron can take a surprising number of different
Kaynak: Heptahedron

It is a type of heptahedron with 7 faces , 15 edges , and 10 vertices . As a semiregular (or uniform) polyhedron : If faces are all regular
Kaynak: Pentagonal prism

The naming system is again based on Classical Greek, for example tetrahedron (4), pentahedron (5), hexahedron (6), heptahedron (7),
Kaynak: Polyhedron