What is the term for an easement that does not benefit any land owned by the easement owner?

The correct term for an easement that does not benefit any land owned by the easement owner is an "easement in gross." An easement in gross is established for the benefit of a person rather than for the benefit of a specific piece of land. This type of easement is often associated with commercial or personal reasons, allowing the easement holder to use the property for a specific purpose, such as utility access or fishing rights, regardless of whether they own adjacent land.

In contrast, other types of easements serve different purposes. An easement by necessity arises when a property is landlocked and requires access to a road or another property to ensure its use. An easement by prescription is established through continuous and open use of someone else's land without permission for a statutory period. An express easement is granted through a written agreement and specifically defines the rights and responsibilities associated with the easement. These distinctions underscore why the easement in gross is the appropriate term for the scenario described in the question.