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There is no special name: they are polygons, as are shapes with 3 or 3 million sides.
There is no special name that distinguishes shapes with more than four sides from shapes with four or fewer.
Prefices are used to indicate the number of sides, angles, faces or solid angles (in 3d objects).
There is no special name. The term irregular is not appropriate because a rhombus is irregular but it has equal sides.
There are an infinity of such shapes so it is not possible to answer the question in a finite universe.