Bigender

Bigender is a nonbinary identity in which someone has two distinct gender identities either at the same time, or at different times all together. Bigender people can experience any two genders, including binary and non-binary genders. One or both of their genders could be fluid or fluctuating, in which case they may identify as genderflux or genderfluid.

History
One of the first recorded instances of bigender being used comes from a trans organization called the Human Outreach and Achievement Institute in the 1980s which defined "bigenderist" as a type of androgyne.

The original bigender flag was created by no-bucks-for-this-doe. The date of creation is unknown but it existed at least before July 30, 2014. It is still widely known this flag has become controversial, due to allegations of the creator being abusive and transphobic. The flag is also disliked as it only seems to focus on male-female bigender people.

The most popular bigender flag was created by an unknown person on or before August 23, 2015.