Cendgender is an umbrella term for any genderfluid identity that switches between a gender and its antigender. This could be cendboy, cengirl, and cendnonbinary/cendenby.
History
Cendgender was coined before August 25, 2014 by tumblr user mogai-flag-makers.
Flags
The Cendgender flags were coined by pride-color-schemes and pastelmemer on Tuesday, 26, July 2016. The cendgender uses shades from the non-binary flag, while the cendboy and cendgirl use blue shades for masculinity and pink for femininity. [1]