triangulation point
noun/traɪˌæŋɡjuˈleɪʃn pɔɪnt/
/traɪˌæŋɡjuˈleɪʃn pɔɪnt/
(also trig point)
(specialist)- a position on a high place used as a reference point, especially by people who make and use maps. It is usually marked on the ground by a short stone pillar.
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triangulation point