Audi's trademark is four connected rings. Since the company was originally formed by the merger of four companies, each link is a symbol of one of them.

Audi's existing four-serial trademark was originally the symbol of 1932 automobile alliance, symbolizing the alliance of four automobile companies: Audi, Horsey, DKW and Rover. 1965, with the rebirth of Audi brand, continue to use the four-ring logo. This modification, Audi will naturally not change the basic pattern of the Fourth Ring Road, but the Fourth Ring Road has a sharp edge and the surface has a golden luster. At the same time, Audi's standard fonts have also changed. Simple fonts replaced the original bold letters, and the position was changed from directly below the Sihuan trademark to the lower left.

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