Trigender
Trigenderism is a non-binary gender identity in which one shifts between or among the behaviors of three genders, which could include male, female, and third gender (or genderless, non-gender, polygender, or any other variety of genderqueer identities).
Gender shifts
A trigender person may shift from one gender to another depending on the individual's mood or situation. Someone who is also gender fluid may mix two or more genders at a time. Trigender falls under the general category of genderqueer or androgyny, a gender identity that goes beyond the normal binary gender system (male and female) and tends to be a catch-all place for other gender identities. It can also be seen as the equivalent cultures that recognize individuals to define their own sense of self.
Trigenderism does not equate to dissociative identity disorder, which is a mental illness where multiple personalities do not share memories. In most Western or European societies, straying outside the gender dichotomy is socially unacceptable. Western influence and Carolus Linnaeus' work, which encouraged a categorization of life, has led to marginalization of those outside of the heteronormative realm.