Syskid

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A syskid is a headmate that behaves or otherwise feels like they are a young age. Though the original term was intended for use of traumagenic systems, the term is sometimes used by any young headmate in any origin.

Coining
The term was coined January 13th, 2017 by the Tumblr blog Syskids. The term was intended to be an alternate term to little for those uncomfortable referring to themselves as such. Though originally intended to be only for traumagenic systems, since the coiner has left the community due to realizing they were not an OSDD system, the term has become more used by other origins.

Related Terms
The term was created as an alternate for little. Systeen, sys-nh, and syspet were also coined by the same person.

Middle and big are other common age indicators. Age sliding is when a headmate varies in how old they feel, often going back and forth between adult and little, but can be any ages. If a little holds more "adult" kinds of trauma, they may use the littlex label too.