Cendgender is when one is both antibinary and another gender. This could be Cendboy, Cengirl, and Cendnonbinary.
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 both the non-binary and antibinary flags, while the cendboy and cendgirl use blue shades for masculinity and pink for femininity, also using shades from the antibinary flag.