It is called a face of the polyhedron.
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A polyhedron is a three dimensional figure made up of sides called faces, where each face is a polygon.
It's a polyhedron. A polyhedron (plural: polyhedra) is a three - dimensional figure made up of sides called faces, each face being a polygon.
Each surface of a polyhedron is called a face.
There is no specific name nor a specific shape for such a polygon.
A solid cannot be bounded by one polygon. A solid bounded by polygons is called a polyhedron.