Pillars are the vertical or near vertical supports of an automobile’s window area or greenhouse—designated respectively as the A, B, C or D-pillar, moving from the front to rear, in profile view. The consistent alphabetical designation of an automobile’s pillars provides a common reference for design discussion and critical communication. As an example, rescue teams employ pillar nomenclature to facilitate communication when cutting wrecked vehicles, as when using the jaws of life. In American and British English, the pillars are sometimes referred to as posts (A-post, B-post etc.).

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