Octahemioctahedron

Octahemioctahedron
Type	Non-convex uniform polyhedron
Faces	8 triangles 4 hexagons
Edges	24
Vertices	12
Wythoff symbol	${\textstyle {\frac {3}{2}}\,3\mid 3}$
Dual polyhedron	octahemioctacron

In geometry, the octahemioctahedron or octatetrahedron is a nonconvex uniform polyhedron, indexed as U₃. It contains twelve faces (eight triangles and four hexagons), twenty-four edges, and twelve vertices. Its vertex figure is an antiparallelogram. Since its hexagonal faces pass through its center, it is a hemipolyhedron.