Spring Strut.
Cartridge and Base of the Suspension Strut Assembly.

Suspension Shock or Strut
If your struts or shocks are worn or weak, you may experience problems like an excessively bouncy ride, your suspension bottoms out more easily than it used to, or your vehicle feels unstable on bumpy roads. You may also notice fluid leaking from your strut. If this is the case for your Volvo , have a Volvo certified technician diagnose and repair your suspension system with factory genuine parts.