Coil-Over: an automotive suspension device which refers to a spring or "coil" mounted over the damper (shock or strut).
There are advantages to the coil-over versus a conventional spring and damper system that include ease of installation and simplified height and stiffness adjustment. Many coil-overs offer easy fine-tuning that's not available from conventional suspension systems.
Coil-Over Kits are available for many German vehicles such as Porsche, BMW, Audi, and Mercedes-Benz. There are also many domestic and Japanese fitments for cars such as Corvette, Mazda Miata and RX7, Nissan GT-R, 350/370Z, and many others.