triangulation pillar en · NOUN
Meanings
- (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.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| triangulation pillars | Number=Plur | lexicographic |
Synonyms
trigonometrical station · trigpoint · triangulation station · trig pillar