The Audi logo consists of four overlapping rings that represent the four founding companies of the Auto Union consortium - Audi, DKW, Horch, and Wanderer. The logo was originally designed in 1932 and has gone through several updates over the years, but the basic design has remained consistent. The four rings are meant to symbolize the unity and strength of the company, as well as its commitment to innovation and progress. The logo is typically displayed in silver or chrome on Audi vehicles, and is often accompanied by the brand name written in a sleek, modern font.