Interiplural

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An interiplural is a headmate who is a part of a larger system and who identifies as plural themself, but not as a subsystem for any reason.

Related Terms
This term is not to be confused with intraplural (a member of a subsystem who may or may not be the host/core/main of the collective).

A plural non-system is a collection of people who do not identify as a system, for multiple reasons.

A plurallet is a singlet that is plural in some way, either because they are fragmented, their plurality fluctuates, or they feel like they are in between/both plural and singlet.

Other related terms may be intrasinglet, sisamate, subsystem, and median.