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.
Pensions in the United Kingdom
These are type "sui generis" as they either reward a career in domestic politics or are awarded in the colonial context not on grounds of justice, contract or socio-economic merits, but as a political decision, in order to take a politically significant person (often deemed a potential political danger) out of the picture by paying him or her off, regardless of seniority.