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A multi-piece spindle designed specifically for installation on just one side of a door is referred to as a split spindle. This design allows for the handle or lever to be mounted without the need for a corresponding mounting on the opposite side. Split spindles are particularly useful in situations where only one side of a door requires a locking mechanism or handle, such as on interior doors that don’t need access from both sides.

In contrast, other terms might refer to different types of spindles or designs that are not intended for singular installation. The single spindle usually implies a simpler, single-piece mechanism designed for use where both sides of the door may require operation. Half spindle can be associated with a partial design, but it is not a standard term in locksmithing. Dual spindle suggests a mechanism that accommodates operation from both sides, which does not align with the configuration described in the question.