ANGLE HEAD
It is generally part of the foundation of the main corner of a building. It is the most important stone in the building, because of the support it provides and what it symbolizes.
Placing the corner head required a ceremony, during which the Canaanites before Joshua often offered infant sacrifices. The name of the institution (company or government) that built the building was inscribed on the stone. Christ is the cornerstone of the church (Mt. 21:42).