Isogender is a gender Modality which refers to when someone does not identify as cisgender or transgender.
Examples of Isogender:
A bigender, or otherwise multigender, individual who doesn't really feel transgender as a significant portion of their gender strongly resembles/is the same as their AGAB and isn't dysphoric towards their gender.
A non-binary individual who doesn't really feel transgender as their gender is strongly similar to their assigned gender as birth.
Someone who stops feeling gender incongruence sometimes or someone whose gender incongruence fluctuates in intensity.
(Not really, there's too many to list in a single post)
Transgender: \
When one's assigned gender at birth is different from one's actual gender.
Ipsogender: \
Intersex people who identify as their assigned gender at birth, but do not feel the term "cisgender" applies to them.
Ultergender: \
Intersex people who identify as a gender other than their assigned gender at birth, but do not feel the term "transgender" describes them due to being intersex.
A "trans intersex" person.
Cisn't: \
An umbrella for anyone who isn't cisgender.
Transn't: \
An umbrella for anyone who isn't transgender.
Isogender: \
When you're not cis, but you don't identify as trans.