Triangulation station

A triangulation station is a fixed surveying station, used in surveying. 

It may also be known as a triangulation pillar, trigonometrical station, trigonometrical point, trig station, trig beacon or trig point, and sometimes informally as a trig,

The names of triangulation stations vary regionally; they are generally known as trigonometrical stations in North America, trig points in the United Kingdom, New Zealand  and Australia, and trig beacons in South Africa; triangulation pillar is the more formal term for the concrete columns found in the UK.

Category:Cartography
Category:Trigonometry