For example, a figure-8 is a wedge of two circles, and the wedge of three circles is a point with three loops coming from it.
The double curve for an immersed real projective plane forms a wedge of three circles, since it must have a triple point . This can be seen in the double curve of the polyhedral model presented here.
8/12/94 firstname.lastname@example.org --
The Geometry Center