trig point

Etymology
.

Noun

 * 1)  A fixed pillar with a metal housing for a theodolite on the top of a high point in the landscape; originally used for making Ordnance Survey maps.
 * 2) Any fixed structure that marks a measuring point used in triangulation.

Synonyms

 * triangulation pillar
 * triangulation station
 * trigonometrical point

Translations

 * Finnish: kolmiopiste
 * Scottish Gaelic: carragh-triantanachaidh