"Male to non-binary", someone who was born as a woman but identify as non-binary. Not widely used and controversial for some. Mostly use they/them or neopronouns.
"Are you a man or a woman?"
"I am MtNB, I use Ne/Nem pronouns."
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(LGBT) Initialism of male-to-nonbinary (transgender or transsexual).
I am an MtNB nonbinary person.