Sui generis
A similar case that led to the use of the label "sui generis" is the relationship of New Caledonia relative to France, because the legal status of New Caledonia can aptly be said to lie somewhere between a French overseas collectivity and a sovereign nation. Although other examples of such status for other dependent or disputed territories may exist, this arrangement is unique within the French realm.
Transgender
Among the ancient Middle Eastern Akkadian people, a "salzikrum" was a person who appeared biologically female but had distinct male traits. "Salzikrum" is a compound word meaning "male daughter." According to the Code of Hammurabi, "salzikrūm" had inheritance rights like that of priestesses; they inherited from their fathers, unlike regular daughters. A "salzikrum's" father could also stipulate that she inherit a certain amount.