Which term best describes the framework used to define coordinates in this domain?

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Defining coordinates relies on a coordinate system, the framework that specifies how coordinates are measured, named, and interpreted—covering axes, units, origin, orientation, and how those coordinates relate to the earth through a datum or projection. This makes coordinate system the best choice because it encompasses the entire structure used to define coordinates across the domain, not just a specialized instance or a single reference point. A local plane coordinate system is a type of coordinate system tailored for a small area, but it’s not the broad framework. A specific geodetic datum like Luzon Datum 1911 defines the reference surface, not the overall framework for coordinates. A reference point is merely a single point used as a baseline, not the system that defines coordinates. Therefore, the term describing the framework used to define coordinates is coordinate system.