A glossary of terms relating to automotive design. Some terms may be found at car classification. 0–9 One-box form A categorization based on overall form design using rough rectangle volumes. In the case of the one-box, also called a monospace or monovolume, it is a single continuous volume. Slight wedge formed front or rear are still generally placed in this category. E.g. buses and the original Ford Econoline. The equivalent French term is volume, which will sometimes be used by the British: "1-volume form". Two-box form A categorization based on overall form design using rough rectangle volumes. In the case of the two-box form, there is usually a "box" representing a separate volume from the a-pillar forward and second box making up the rest. E.g., Station wagon, shooting-brake, Scion xB (2006). The equivalent French term is volume, which will sometimes be used by the British: "2-volume form". Three-box form A categorization based on overall form design using rough rectangle volumes. In the case of the three-box form, there is a "box" delineating a separate volume from the a-pillar forward, a second box comprising the passenger volume, and third box comprising the trunk area—e.g., a Sedan. The equivalent French term is volume, which will sometimes be used by the British: "3-volume form". A A-line The line running over the car, from headlight to taillight, tracing the car's silhouette. B Backlight Rear glass panel. Beltline A demarcation or crease between a vehicles body panels and the side windows. Typically it refers to where an individual wears a belt attached to trousers. Batsman's crease A tangent break feature line running along the centreline of a car. This kind of feature can be seen on many modern Vauxhall, Opel and Chrysler models. Literally derived from the break found on the rear side of a cricket bat. Bezel The trim or bodywork that surrounds a light, holds the face of an instrument in position, or decoratively conceals gaps between bodywork and components as an escutcheon. Often chrome or plastic Binnacle The housing for the instrument cluster on top of or as part of the dashboard. Bonnet The body panel of the vehicle that covers the engine. Typically a horizontal surface, hinged at the cowl, but sometimes hinged at the headlights instead. Also known as a hood. Boot The trunk or liftgate of the vehicle that opens for access to the cargo area. Typically at the