triangulation pillar
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English
[edit]Noun
[edit]triangulation pillar (plural triangulation pillars)
- (UK) A concrete pillar used by the Ordnance Survey as a point for taking theodolite measurements, used in determining the exact shape of the country in a mid-20th-century retriangulation project.
Synonyms
[edit]Further reading
[edit]- triangulation pillar on Wikipedia.Wikipedia