Bespregender is a Xenogender which is related to ones own, custom religion (as opposed to an established, widespread religion).
The term Bespregender was coined by tumblr user pupyzu on May 28th, 2021. The flag was created on the same day. It has no confirmed meaning.
The alternative Bespregender flag was coined by wiki user Namira-07 (sheogorath#9023 on Discord) on August 13, 2022.