Trig point, also known as triangulation station or reference station, refers to a fixed point used in surveying and mapping. Other synonyms for trig point include geodetic station, control point, survey station, and benchmark. These are all points that serve as a reference for determining the position and elevation of other points in a given area. A benchmark, for example, is a permanent mark on a building or other structure that serves as a reference point for measuring elevations. A survey station is a point where surveying instruments are set up to measure angles and distances. Overall, these various terms all refer to important reference points used in the process of surveying and mapping.