A fragment that is a hundredth of a headmate compared to what a fully formed headmate in their system is.

A system member who is sourced from the concept or passing of time.

A member or system that formed from consuming a certain item, food, drink, or substance.

A system member who's source comes from some sort of consumable food, drink, substance, or object.

An individual member of a syncryptoid. They are hidden in some way from the whole system, a part of the system, or people outside of the system. Cryptoids are usually group together, whether that be consciously or subconsciously.

They may or may not be aware that they are hidden, and there could be a reason (conscious or subconscious) behind them being hidden.

A fragment that is a tenth of a headmate compared to what a fully formed headmate in their system is.

A system member who takes other members and breaks them down or splits them up into fragments or headmates. They can do this with or without the member's consent. They could also not be conscious of their actions in breaking apart members.

Extirpator is not an inherently abusive, inhumane, or persecutory position. It can result in system chaos, but extirpators often serve a necessary role and don't often choose their ability.

A NPW that is either meant to only have one or limited function or an NPC that instead of appearing as a character, it's an actual place in the headspace.

A system member who is based on or around a source. The source can be both fictional and non-fictional, and it can come from both within or outside of the system.

The term is a mix of introject and -tive, both terms which have been used to describe sourced members. The prefix mid- means middle, as it is meant to be a bridge between the terms.

A fragment that is a thousandth of a headmate compared to what a fully formed headmate in their system is.

A system member who can only appear as other members of either their system or another system. They are not a midtrotive because they only appear as the person due to not having a visual or physical form of their own, or due to a similar effect as singletsona. They are not the person they are appearing as and are aware of themselves not being that person. They can look like anyone apart of their own or another system.

A Now-PC who will occasionally speak a repeated phrase or do an action that is triggered by a command of some sort. It could be a phrase or action they did when they were an NPC.

Could also be a member who goes between being an NPC and a system member.

Non-Playable World (NPW). This can either be a (part of a) headspace that can be accessed but not interacted with or a (part of a) headspace that seems to be alive, sort of in the same way as an NPC.

Pantosystem is a system in which most or all members are always fronting. They don't tend to leave the front or move away from the fronting room, and memories are often shared without barriers.

Comes from the prefix panto-, meaning "all".

A system member or a system who formed due to their phobia(s) and/or being exposed to the phobia(s). They can also be a midtrotive of the phobia.

Polyauxiliary is a system with 100+ NPCs in the headspace.

Posier is a term to describe a system member who fronts in professional situations, or in general situations where they need to appear as calm and have good behavior.

A system member who stays the same. Their identity, roles, looks, and personality don't change at all or don't change for a long time. They are unable to develop any part of themselves.

A static system is one in which most or all of the members don't change, the member count stays the same, and the headspace doesn't expand or collapse.

A group of partially hidden headmates who all are related to each other in some way. Could be a subsystem, sidesystem, cluster, or any type of group within the system. They could be hidden to the whole system, to certain parts of the system, or from people outside of the system. They could also have no physical appearance and may not show up in the headspace.

They may or may not be aware that they are hidden, and there could be a reason (conscious or subconscious) behind them being hidden.

Torpidsystems are systems where the body is mostly or always on autopilot. Headmates may take over the body from time to time, but usually, no one is truly fronting. This usually happens when headmates don't feel comfortable fronting unless they need to.

System members can be conscious and aware, but not fronting.

A window is a way to view what is going on outside of the headspace or with the current fronter(s), without having to be in or near the fronting room. It appears like a window, an opening of some sort, or even as some sort of screen. This is usually used by protectors/protective headmates or by headmates that manage the system or know a lot about the system (gatekeepers, managers, overseers, internal self helpers, archivist, etc.)