Nightgender

Nightgender or Nighttimegender is a xenogender where your gender where your gender feels connected to nighttime, the night itself, or things that exist or happen at nighttime. A similar term is Noctisgender.

Nightgender has also been used to define a gender that feels agender but in place of gender, it's filled with darkness. This definition is similar to Tenerbrigender.

History
Nightgender was originally coined by Sapphire Crimson Claw, a controversial Tumblr user, on March 1, 2017. The term was given a new definition, possibly by Wikia FANDOM user Meiko-is-shifting.

Flag
The current flag was made by an unknown user and has an unknown meaning.

The first alternate flag was created by Missing-Mogai-Labels on or before November 28, 2020. The black & grey stripes are the same as the agender flag, because at it’s core, nightgender is an agender subset. The blue tones refernece dark nights and coldness. The middle stripe being very visible is also stolen from the agender flag, as the middle one in that flag is the only one with color.

The second alternate flag was created by Tumblr user MogaiCrow on October 25, 2020. The colors are based after the different colors of night.