Abimegender is a xenogender which is profound, deep, and infinite. It is best described by when one mirror is reflecting into another mirror creating an infinite reflection. Abimegender can be used by itself, or as a prefix to describe another gender (abimegirl, abimeagender, abimefluid, etc).
The prefix "abime-" comes from Old French, meaning "related to abyss", which is further derived from the Latin prefix "a-" meaning "without" and "byssos," meaning "bottom".
Flag
The flag is suppose to resemble one mirror reflecting into another, having the reflections be endless. The color green is used because it is not only a color associated with non-binary people, but also because it's the color that mirrors retain when reflecting into each other.