It seems to be a general term. Gizmo as I understand it typically refers to the UI tools for move, rotate, and scale. As @SVR33 uses it its more like actor components. If the component is a mesh for whatever reason it homes in on a specific edge. If the component is a scene component it is really just a single point and the homing strikes true. In my game I’ve added a target reference point scene component and aligned it to the center mass of my meshes. This gives a much better lock on point and reference for homing.