Which term describes the support provided to the structure when removing a rivet?

The term that describes the support provided to the structure when removing a rivet is "bucking bar." A bucking bar is a heavy piece of metal that is placed on the opposite side of the rivet being driven or removed. It serves two primary functions: it provides a solid backing to support the rivet while force is applied, and it helps absorb the impact of the hammering or other removal tools being used on the rivet.

When removing a rivet, it is critical to have this support to prevent damaging the surrounding structures or components and to ensure the rivet comes out cleanly and efficiently. The bucking bar's weight and shape are designed to provide the necessary force without deforming the structure, making it an essential tool in the riveting process. Other options, while they might sound relevant in different contexts, do not specifically represent the support structure used in the removal of rivets.