What does 4 rings indicate on the Audi A5 engine?

I recently noticed 4 rings above the Audi A5 engine. What do these rings represent and what function do they serve?

The 4 rings on the Audi A5 engine represent the four companies that came together to form Audi. They are Audi, DKW, Horch, and Wanderer. These rings serve as a symbol of the company's heritage and legacy.

The 4 rings on the Audi A5 engine indicate the four stages of the engine's cycle: intake, compression, power, and exhaust. This indicates that the engine is properly functioning and going through each stage smoothly.