If they are all planes, there are three situations: none when parallel, 1 when intersecting, and countless when overlapping.

If it is a surface, it is uncertain, and you can have as many as you want.

As far as that topic is concerned, a * * * is four faces, three planes and a curved surface.

Note that the leftmost line is a visual effect, not the intersection of faces.

There are 6 intersecting lines, including 4 straight lines and 2 curves.