It´s the place where the lifiting device is parked, depending of the machine they also can be used for being able to detach the device from the main spreader, when there´s a mechanism that fix the lifiting device to the main spreader.
The parking stand can be used in many lifting devices as lifiting beams and frames, Over Height Frames, lashing cages, RS and FLT attachments…
It can be positioned on the floor or seal beam of the crane.