noun
Meaning 1
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.
Definition source: English Wiktionary via Wiktextract
Usage: UK
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided