New answers tagged part-identification
It is a ground, and as Digital Lightcraft "Ground Bolt" sounds reasonable. The picture below show another view from the same car. You can see from the picture that it is indeed a terminal that's bolted to the chassis.
Hard to say without knowing the car, but based on previous experience, its likely to be "Ground Bolt" IE ground / earth (-) for the electrical system to the chassis/shell/monocoque
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