Can be. It would be the net of the polyhedron.
A net is an arrangement of polygons, joined edge-to-edge, that when folded up, form the surface of a polyhedron.
Yes, steel can be folded. This is a common practice in the production of "damascus" or pattern welded steel.
Any wire structure that is not flat. A piece of paper folded so it is not flat. If you don't like that, try a cylinder or a sphere or ellipsoid, or a brick with a rounded end, or any polyhedron where 1 or 2 faces are spherical bulges or are missing etc.
A projection. A net is the other way around: a 2-d pattern that can be folded into a 3-d shape.
A two-dimensional shape that can be folded into a three-dimensional figure is often called a net.
I don't know but you have bad grammer * * * * * It is a net.
folded mountains are folded
Generally, fabric is used as purchased, folded in half with finished sides (selvages) together, and wrong side inward.