Fencedspace refers to a headspace that is centered or located aroun/in a specific member. It can be located within a different headspace, but feels separated from it while not being completely disconnected, and is not caused by being a sisasystem.
It is often difficult or impossible for others to get into. It may also have certain requirements for others to access, such as permission from the member it's centered around or a special ability/attribute like being a gatekeeper.
A Fencedspace may be shared between a couple members in certain circumstances that do not make it a sisasystem.
Personalspace is another word for Fencedspace.
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Sector applies to distinct areas in headspace that are separate and function differently, but have few travel and communication problems and are not centered around a specific member.
Layer is similar, however it is more separate and disconnected, and not centered around a specific member. It is also often a lot larger.
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We chose Fencedspace due to ours feeling very fenced and gated, making it separate but not disconnected. Personalspace was chosen as an alternative, especially for those who don't feel theirs is as restricted (though not exclusive to them), and it focuses more on the key aspect of it being centered on a specific member.