Rainbowgender is a xenic aesthetigender under the colorgender umbrella connected to the color spectrum.
History
The term was coined alongside many other colorgender identities by Tumblr user mogai-guy on February 3rd, 2019.
Flag
The flag was coined by Tumblr user mogai-guy on February 3rd, 2019.The second is an alternative flag created as a simpler version of the flag that eliminates the gradient effect which is difficult (and expensive) to use when creating a physical flag.