A vertex or geodetic point is a marked point that indicates an exact geographical position, forming a triangulation network with other geodetic vertices. In some autonomous communities, they are also known under the name pilón[1]​ or pila.[2]​.

The exact position of the vertices is used to help create topographic maps on both a national and regional scale.

In Spain there are about 11,000 vertices that are usually formed by a pillar 120 centimeters high and 30 centimeters in diameter supported by a cubic concrete base, all painted white. They are normally in high, clear places from which other similar points can be seen, so they are usually in places that have good panoramic views. Since 1975 they have been protected by the Law on Geodetic and Geophysical Signals.