Agender

Agender, also called gendervoid, is the lack of gender. It is a non-binary gender identity in which someone is not male, female, or any other gender. While some agender individuals completely lack gender, some may call themselves agender their gender is neutral or neutrois, or their gender is unknown or undefinable; their gender may not aligning with any binary or non-binary categories, or they may not caring about gender as a label.

Many agender people also identify as non-binary, genderqueer, or transgender, though some choose those avoid these terms.

History
The first recorded use of the word agender on the internet seems to come from a post on the site UseNet, on July 28, 2000. It was used in a discussion thread titled "alt.messianic". The user Miriam Wolfe wrote "All I understand is that G-d is amorphous, agender, etc. so "image" can't be a physical or gender or sexual thing." There were a few other instances of the word being used, but these also were either in reference to God, or were talking about people presenting in a gender neutral manner (not as a specific gender identity).

The first instance where the word was used in reference to people as a specific identity seems to also come for UseNet, in a thread titled "alt.politics.democrats". The user man_in_black529 wrote "But despite this near-universality of gender, cultures can have transgender, agender, and hypergender individuals."

In both these cases the word agender was not defined, presumably the definition was already known at the time. It's safe to assume that the word agender existed before these posts, and possibly had a similar meaning to what it does now. However, earlier uses of the word are not recorded.

Flag
The agender flag was designed by the Tumblr user Transrants in 2014. The color meanings are as follows: Black represents an absence of gender, and grey represents partial gender. Green represents the non-binary nature of this gender, because green is the inverse of lavender (a mixture of pink and blue, meaning a mix of female and male).