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The German automotive concern, Volkswagen Group has, since the 1970s, developed a series of shared automobile platforms for their motor vehicles.[1][2]
Originally, these were identified using a simple alphanumeric system. The first letter prefix indicates the car classification or physical size (A, B, C or D - for 'traditional' cars); followed by a number to enumerate different generations of the same class. However, more recent platforms have formally departed from this convention, although the older alphanumeric codes continue to be used informally.
These platforms may be used by one or more marques of the Group.