The third of five bonding-related terms defined in Art. 100 of the NEC is "bonding jumper, equipment." The definition may be confusing, leading to bad practices. The Art. 100 definition is: “The connection between two or more portions of the equipment grounding conductor.”
The confusion arises in the word “grounding.” An equipment grounding conductor (EGC), if installed properly, isn’t actually grounding the equipment it’s connected to.