vertex
Definitions
The highest point of something; the apex or summit.
Each of the angular points of a polygon, polyhedron, or other geometric figure.
The point at which two or more lines meet, such as the corner of a triangle or the tip of a cone.
Examples
The top point of the pyramid is known as its vertex.
In geometry, a vertex is the point where two or more lines meet.
The graph reaches its highest vertex at the peak of the mountain.