Winteralfs,
Good question/idea. If so, I would have changed that. While clicking on the node that feeds each layer of the Material, then in the Information panel on the lower left shows, that this name is based on the ID. This ID is part of the system to be able to update and avoiding conflicts. Yes, it sounds weird, but I have no information that a “pipe” | is used.
Of course, since each node has this unique ID, if you don’t like one ID, delete and call up a new one.
I hope my sending out reports will show some results.
All the best