A Polyhedron Compound obtained by allowing two Cubes to share opposite Vertices, then rotating one a sixth of a turn (Holden 1971, p. 34).
See also Cube, Cube 3-Compound, Cube 4-Compound, Cube 5-Compound, Polyhedron Compound
References
Holden, A. Shapes, Space, and Symmetry. New York: Dover, 1991.