The Reuleaux triangle is an equilateral triangle of side r, which is the radius of three circles that have each of its vertices as the center, it has multiple properties, including the design of some automobile engines.
That's Hans, and they are very revolutionized cars. This shows the large number of applications that geometry can have.
The Wankel engine has a rotor shaped like a Reuleaux triangle. The Wankel engine has been used in automobiles, among them Mazda and NSU.
