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."
Related rights
Within the European Union, the rights of film producers (as opposed to directors) and database creators are also protected by related rights, and the term is sometimes extended to include the "sui generis" rights in semiconductor topologies and other industrial design rights. A practical definition is that related rights are copyright-type rights that are not covered by the Berne Convention.