Slots, holes, dimples and other dents built into unibody panels to protect the vehicle from collision energy are called?

The term that describes slots, holes, dimples, and other dents built into unibody panels for the purpose of protecting the vehicle from collision energy is "crush zones." These elements are strategically designed areas within a vehicle's structure that are meant to deform and absorb energy during a collision, thereby reducing the impact forces transmitted to the passenger compartment.

Crush zones play an essential role in vehicle safety; they help to manage the energy generated during an accident, allowing the vehicle to crumple in a controlled manner. By doing so, they protect the occupants by minimizing the risk of injury from the internal structure of the vehicle.

While other choices may refer to various aspects of vehicle structure or safety features, "crush zones" specifically addresses the design elements that serve to manage collision energy effectively. This understanding is crucial for assessing vehicle safety and structural integrity in the context of physical damage appraisals.