Novigender (also known as Novogender) is a gender in which one's gender expereince (or lack thereof) is complicated in such a way that it is difficult or impossible to fit into one term. Novigender falls under the umbrella of pomogender, which is defined as a gender in where one denies or does not fit any labels for any particular gender. A pomogender person may know they are not cisgender, but cannot, or is not interested in specifying their gender.
Simply put, Novigender individuals' gender experience cannot be expressed simply or in a single term or word.
History
Novigender was coined by Tumblr user creativeflipflop in the August of 2014.
Flag
The flag color meanings are as follows: Grey represents neutrality and confusion of gender; Blues represent the varying stages of clarity people may feel; Orange represents individuality and embracing the lack of clarity involved in novigender.
Resources
https://pridearchive.tumblr.com/post/91381492171/novigender-pride