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.
Svecchamrityu (Iccha-mrityu)
Svecchamrityu (Sanskrit: स्वेच्छामृत्यु) {Sva (self) + iccha (will) + mrityu (death)} is an adjective which means - having death at one’s own power or dying at one’s own will It is also called Iccha-mrityu (इच्छा मृत्यु) meaning self-willed death but it is not to be confused with immortality or self-inflicted death. Shantanu had granted to his son Gangaputra Devavrata, also known as Bhishma, the supernatural power of Svecchamrityu. Mahabharata records that Bhishma did choose the time and manner of his own death.