The term "metal body" refers to a type of vehicle construction where the main structural components are made from metal. This typically includes the use of steel or aluminum for the frame, as well as other metals such as high-strength steel or alloys in critical areas like pillars and roof supports. The term is often used interchangeably with "unibody" construction, which refers to a similar type of vehicle structure made from a single piece of metal that forms both the chassis and body panels. Overall, the use of a metal body provides increased strength, durability, and safety in comparison to other types of vehicle constructions such as traditional body-on-frame designs.