Insisystem

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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 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.