Ambigender

Ambigender is a static bigender identity in which two genders are experienced simultaneously with no fluidity or shifting. In addition to being a type of bigender identity, ambigender also falls under the multigender umbrella term.

History
In a 2010 encyclopedia, ambigender is listed as a type of "androgyne" gender. "Androgyne identities include pangender, bigender, ambigender, nongendered, agender, gender fluid, or intergender."