Exgender

Exgender also known as Egender can be defined as an outright refusal to accept any gender in, on, or around the gender spectrum. It also has a genderless feeling that is far stronger than Agender.

It is unknown who this term was coined by.

Flag colours and meanings
There are three exgender flags, It is unknown who created one of them, one was created by nova-pride-flags, and the other was created by pride-flags on deviantart.