Vertex (noun)

1. The highest point of a shape or object, especially one that is pointed, cone-shaped, or has corners.
2. The highest or topmost point, position, or degree of something.

Origin:

Late latin, from latin vertere meaning 'to turn'.

Examples:

1. The vertex of the triangle is the point at which the three lines meet.
2. She climbed to the vertex of the mountain to get a better view.
3. The vertex of the graph showed the highest point of the market.
4. The vertex of the pyramid was adorned with gold.
5. The vertex of the company's success was reached in the year 2000.