Sui generis
In sociology, the "sui generis" is what has been externalized, then internalized in the overall public and becomes a part of society that simply exists in its construct. It is not something that is not thought to have been created, because it is imbedded in everyone's way of thinking and being. Instances include the idea of love, or going to school, or clothing belonging to a specific gender. These examples are "sui generis" for they simply exist in society and are widely accepted without thoughts of where they come from or how they were created.
Town and country planning in the United Kingdom
Various uses are considered to be "sui generis", meaning that they are considered to be a use class in themselves, and not part of an existing use class. These specifically include:A key part of planning control is exercised in the UK by preventing any significant development of property without permission by the local authority. In Part III of the Town and Country Planning Act 1990, under section 59 the Secretary of State delegates to public bodies the right to grant planning permission.
A long list of other unconsolidated Acts and Regulations also affect UK planning. For example, the Localism Act 2011 abolished the Infrastructure Planning Commission for national projects, set up by the Planning Act 2008 and recentralised control in the hands of the Secretary of State.