What term is used for a right to use land that is attached to a specific owner, not the land itself?

The term that describes a right to use land attached to a specific owner, rather than the land itself, is known as an easement in gross. This type of easement benefits a particular individual or entity, allowing them to use another's land for a specific purpose, such as access or utility installation, without the easement being tied to the land's ownership.

In contrast, an easement appurtenant is tied to a piece of land and benefits the landowner, meaning that it transfers with the property when it is sold. A common easement generally refers to those shared by multiple parties, often found in subdivisions or condo associations, and would not specifically attach to a unique individual. The term exclusive right typically refers to rights granted by a property owner to individuals or businesses for specific use, but it does not specifically refer to land use rights like an easement in gross does.