Nonbinary people consider themselves neither male nor female, both male and female, male and female individually but at different times, or any other vector combination of genders besides {1,0} and {0,1}; naturally, they are all transgender. They're fairly uncommon, largely because the idea that identifying as nonbinary is not available to the vast majority of people and would be stigmatized if they did choose to adopt it.
Huh, interesting. I had never heard of that, thank you.
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.