Today I was reading Jean-Louis Loday's classic paper, "Realization of the Stasheff polytope", in which he produces a simple and very pretty realization of the associahedra as convex polytopes. He introduces the permutohedra like so:
Let us recall the definition of the permutohedron (alias zylchgon).
I had not heard this alternate name for permutohedra before, and tried to figure out the origin, but couldn't find anything. Sadly, Loday is no longer alive, so I can't ask him. Does anyone know the origin of "zylchgon"?