A car wishbone is known to be a transverse link suspension shaped like an A. It has a wide base that enables it to accommodate lateral. The coil spring accumulates to the wishbones in order to control the vertical movement.
It depends on the car. On cars from the 1920s and 30 the wishbones controlled the fore and aft movement of the axles. The term is sometimes used to describe the upper and lower control arms in the front suspension. The spring and shock sit on the wishbone and attach to the frame, controlling the up and down movement of the vehicle.