Fossilogender is a sciencegender defined as "a gender that exists but is buried deep inside your identity. It needs to be dug out carefully."1
History of the term
Fossilogender was coined on December 12, 2019 by tumblr user mydinospace (later myfossilospace). The flag was created at the same time by tumblr user mogaiennis (aka mogaistefan).2
Fossilogender in its coiner's words
"Fossilogender is a term that doesn’t so much describe your gender itself but the journey to discover your gender. If you have a fossilogender, you are aware that your gender exists somewhere within your identity, but it is buried deep and must be dug out carefully before you are sure what it is.
If you have multiple gender identities, they may all be a fossilogender to you! You may have some genders that are fossilo and some that are not! And very importantly, you don’t have to stop identifying as fossilogender if you ever dig up all your buried genders! Your journey to finding your gender is just as important as your gender itself and fossilogender exists as a way of describing that experience. You can use ‘fossil/fossilo’ as a prefix to any fossilogenders you have, e.g. fossilogirl, fossiloboy, fossilagender, fossilenby."3
