Offgender

Offgender is a gender in which someone feels most closely represented by a certain gender, but is not that gender. For example, an offboy would feel very close to the description of "boy" yet is not a boy. It can be likened to what the color off-white is to white. It may be similar to paragender or perigender.

History
The offgender, offboy, and offgirl flags and symbols were designed by now unavailable Tumblr blog pride-flags-for-us.

Resources

 * 1) Offgender by Pride-Flags on DeviantArt
 * 2) Offboy by Pride-Flags on DeviantArt
 * 3) https://www.deviantart.com/pride-flags/art/Offgirl-604669916