Rainbowgender is a xenic aesthetigender under the colorgender umbrella connected to the color spectrum.
The first flag is the flag created by the person who coined the term. 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.
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.