A
triangulation station, also known as a
triangulation pillar,
trigonometrical station,
trigonometrical point,
trig station,
trig beacon or
trig point, and sometimes informally as a
trig, is a fixed
surveying station, used in
geodetic surveying and other surveying projects in its vicinity. The names of triangulation stations vary regionally; they are generally known as
trigonometrical stations in
North America,
trig points in the
United Kingdom and
New Zealand,
trig stations or
points in
Australia, and
trig beacons in
South Africa;
triangulation pillar is the more formal term for the concrete columns found in the UK.