Sui generis
In local government, a "sui generis" entity is one that does not fit with the general scheme of local governance of a country. For example in England, the City of London and the Isles of Scilly are the two "sui generis" localities, as their forms of local government are both (for historical or geographical reasons) very different from those of elsewhere in the country. 
In a press conference during which reporters were trying to analyse his political personality, Huey Long said, "...say that I am "sui generus", and let it go at that."
Sui generis
In political philosophy, the unparalleled development of the European Union as compared with other international organizations has led to its designation as a "sui generis" geopolitical entity. The legal nature of the EU is widely debated because its mixture of intergovernmental and supranational elements causes it to share characteristics with both confederal and federal entities. It is generally considered more than a confederation but less than a federation, thus being appropriately classified as an instance of neither political form. Compared to other international organizations, the EU is often considered "sui generis" because its legal system comprehensively rejects any use of retaliatory sanctions by one member state against another.