noun
triangulation point
A fixed survey marker used in geodetic triangulation; often a concrete pillar on a hilltop.
山頂に三角点がある。
There is a triangulation point at the summit.
水準点 is a benchmark for elevation, while 三角点 is a horizontal control point for mapping.
Compound of 三角 (triangle) and 点 (point), referring to a point used in triangulation surveying.