Insisystem

undefined:

Insisystem (or inside-system) is a sisasystem that is (usually completely) inside another sisasystem. This could be a subsystem inside a sidesystem, a sidesystem inside a sidesystem, and many others.

Related terms
A subsystem inside another subsystem can also consider a nestsystem. A sidesystem within another sidesystem may be called metaparallel.

A betsystem can be considered semi-insisystem because it is not completely inside another sisasystem.

An insisystem that is inside a sisasystem that is inside another sisasystem (or more) can be considered insiplex.