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