D is for..................

Donald Duck The nick-name given to a prototype 2 litre 'air-line' saloon car before World War 2 which pioneered the use of a spaceframe superstructure.
DB The initials of David Brown, owner of Aston Martin between 1947 and 1972 - ‘DB’ graced every Aston built during his ownership. The DB initials were resurrected in 1993 with the DB7
DP

dp215

Short for Design Project - prefix to many designs and prototypes e.g.. DP212 (GT racing car), DP2034 (Virage)
De Dion A design for the rear suspension/axle used on the Lagonda Rapide and all the V8 range.