What zoning term describes a technique where a district is adopted in the zoning ordinance but not mapped?

The correct answer is the term that refers to a zoning technique allowing flexibility in land use where a district is established within the zoning ordinance but does not yet have a specific geographic location assigned on the zoning map. This allows for the potential implementation of that zoning district in the future, depending on demand or specific circumstances.

Floating zones are particularly useful in urban and suburban planning as they can accommodate future development without the need for immediate mapping. This approach allows developers and city planners to consider the needs of the community and adjust plans as necessary, fostering dynamic growth and responsive land use strategies.

The other choices, such as urban planning and land use plan, generally refer to broader strategies or documents that guide the overall development and organization of space rather than specific zoning techniques. District planning does not accurately capture the concept of an unassigned zoning classification and is instead more focused on the specific planning of designated areas. Thus, floating zones stands out as the correct terminology for the context of the question.