From Non-Binary Wiki:
"Nonbinary is a term that refers to people whose gender is not completely and exclusively male or female. They can identify with not having gender at all, with both binary genders, with a third identity, or an identity which can change over time. Nonbinary people fall under the transgender umbrella term, and nonbinary is an umbrella term itself, although some people use it to describe their specific gender identity too."
nonbinary.wiki/wiki/Main_Page
"Nonbinary gender is any gender that exists outside of the gender binary. That is, any gender not described by just "male" or "female". Even in societies that recognize only two genders, there are still people who find that they don't fit into those two. Despite the lack of recognition of nonbinary genders in Western binarist society, nonbinary genders are still valid identities."
nonbinary.wiki/wiki/Gender_identity#Nonbinary_genders
"Nonbinary (also spelled non-binary) is an umbrella term covering any gender identity or expression that does not fit within the gender binary. The label may also be used by individuals wishing to identify as falling outside of the gender binary without being any more specific about the nature of their gender.
As an umbrella term, nonbinary has similar scope to genderqueer with most nonbinary-identifying individuals also considering themselves genderqueer. However the terms have different meanings and connotations. The term genderqueer predates nonbinary by at least a decade.
nonbinary.wiki/wiki/Nonbinary
See list of 'non-binary identities'
nonbinary.wiki/wiki/List_of_nonbinary_identities
Male & Female refer to sex.
All humans have a sex being either male or female.
(Much of this reminds me of having Dungeon & Dragons rules earnestly explained)