The blue-and-white roundel that you see on almost every car today was first introduced in 1917. It was designed by Franz Josef Popp who drew inspiration from the circular design of a plane’s engine valve.
The logo itself also contains many hidden messages and symbolism: Blue and white colors represent Bavaria while red color represents Germany. The company name “Bayerische Motoren Werke” has 24 letters, which is exactly how many letters are there in roundel when you count them carefully. There are also 3 layers to the roundel if it were to be cut through along with six stars that form an internal hexagon shape.