e/Monostatic polytope

Information
has gloss	eng: In geometry, a monostatic polytope (or unistable polyhedron) is a d-polytope which "can stand on only one face". They were described in 1969 by J.H. Conway, M. Goldberg and R.K. Guy. The monostatic polytope in 3-space they constructed has only 19 faces, the record so far.
lexicalization	eng: monostatic polytope
instance of	(noun) a solid figure bounded by plane polygons or faces polyhedron