Tridecahedron

Common tridecahedrons
Space-filling tridecahedron	Elongated hexagonal pyramid
Hendecagonal prism	Gyroelongated square pyramid

A tridecahedron, or triskaidecahedron, is a polyhedron with thirteen faces. There are numerous topologically distinct forms of a tridecahedron, for example the dodecagonal pyramid and hendecagonal prism. However, a tridecahedron cannot be a regular polyhedron, because there is no regular polygon that can form a regular tridecahedron, and there are only five known regular convex polyhedra.^{[notes 1][1]}

Cite error: There are <ref group=notes> tags on this page, but the references will not show without a {{reflist|group=notes}} template (see the help page).