A regular wing has dihedral-the left panel is straight,as is the right panel, and there is a joint in the middleto establish the dihedral angle. A polyhedral wing has another joint in each wing panel, so there are several dihedral angles.

Lots of model sailplanes have polyhedral wings. Technically, the Corsair would have a polyhedral wing. Even the new huge airbus 380 has a polyhedral wing. But mostly wings that are called polyhedral have conventional dihedral in the center joint and then the tip panes are upswept even more. Take a look at a Goldberg Gentle Lady or a Craft Air Butterfly.