Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
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.