The VH Platform (for vertical/horizontal platform) is Aston Martin's sports car automobile platform. It is used in all of Aston Martin's current lineup excluding the One-77, which uses carbon architecture and the Cygnet which is based on the Toyota iQ. There are five variations of the VH platform.
Aston Martin VH platform Wikipedia
The original Aston Martin Vanquish used an aluminium chassis that evolved into the platform that would go on to underpin all future Aston Martins. At the time it was not considered to be a VH platform but in retrospect it should be treated as one.
The first official VH Chassis debut in the Aston Martin DB9 in 2004 and has been used in that car, with only minor tweaks, ever since.
The second VH platform underpins the 2005 Aston Martin V8 Vantage and its V12 and S variants. It was also used in the 2007 Aston Martin DBS.
The third VH Chassis is used in the Aston Martin Rapide. The platform differs from the first two as it is longer to accommodate the longer four door body.
Based on VH Generation2, Generation4 underpins the new Aston Martin Vanquish. It is based on the Carbon architecture found in the One-77 and uses far more carbon fibre in its design than previous VH Chassis and it, in turn, will be used as a basis for all new Aston Martins in the years to come.