The Niagender Spectrum, or Niaspec, is an umbrella term for anyone on the "'neutral gendered' spectrum" part of the exobinary spectrum. This includes anyone whose gender is being near neutral, adjacent to neutral, or is similar to/in some way resembles neutrality without directly being neutral in nature.
It is similar to, but not the same as ningender. Ningender is for genders that are is some way directly neutral. Niaspec includes genders that are related to neutrality (even if they are not neutral). One does not necessarily have to identify with notions of neutrality or be entirely neutral-aligned.
Examples of niaspec genders may include: epicene, stellarian, neutralflux, etc. Niaspec can also be used as a gender on its own (in that case its usually referred to as niagender instead).
The state of having a niagender or having a gender which exists on the niagender spectrum is called niaty.