This term describes an experience where an alter/headmate(s) in a system has their own system ! The headmates that the headmate has can be called epímates or epíforms, but those are just suggestions :3
Epímates can front, switch and communicate just like any other headmates, but usually through the consciousness of the headmate that holds the system they’re apart of first ,,
( accidental recoin , sowwy ! this can be an alt term for subsystems / nested systems :3 )