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.
Sui iuris
In civil law, the phrase sui juris indicates legal competence — the capacity to manage one's own affairs (Black's Law Dictionary, Oxford English Dictionary) — as opposed to alieni juris, which means someone under the control of another (such as a child or mentally incapable person might be). It also indicates an entity capable of suing and/or being sued in a legal proceeding in their own name (in personam) without the need of an ad litem. (A court appointed representative, acting on behalf of a defendant, that is deemed to be incapable of representing themselves).