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A small triangle with a central dot, marking a surveyed height and position.
Also known as: Trig point, Trig pillar, Triangle with a dot
A triangle with a dot marks a triangulation station — a point whose position and height were surveyed precisely. The pillars they mark are largely obsolete for surveying and remain as landmarks.
Marks a triangulation station whose position and height were established by survey, with the height printed beside it.
United Kingdom · Contexts: Navigation, Maps
Marks a network built for triangulation survey, a method largely superseded by satellite positioning — so most of the pillars now serve as landmarks rather than instruments.
Contexts: History, Navigation, Maps
A small equilateral triangle standing on its base with a single dot at its centre, drawn in blue or black on the map.