vertex

The highest point; the apex or summit.

The highest point of the skull.

The top of the head.

In astrology, the highest point reached in the apparent motion of a celestial body.

The point at which the sides of an angle intersect.

The point on a triangle or pyramid opposite to and farthest away from its base.

A point on a polyhedron common to three or more sides.

A point of maximal curvature on a parabola or hyperbola.