What does the B-pillar of a car refer to?

[MaverickFitz]

The B-pillar of a car, also known as the center pillar, is located between the front and rear doors. It bears the pressure from both the roof and the front and rear doors. Additionally, some additional components, such as the front seat belts, are installed inside the B-pillar. To better achieve force transmission, the B-pillar is often designed to protrude outward. The challenge with the B-pillar lies in achieving a balance between stiffness and weight. Cars also include A-pillars and C-pillars. The A-pillars are located on both sides of the front windshield and serve the following purpose: in the event of a frontal collision, the crumple zones of the car's front longitudinal beams deform first to absorb the impact force, and any remaining impact force is then borne by the A-pillars. The C-pillars are located on both sides of the rear headrests, connecting the roof to the body. Their function is to protect rear passengers when the vehicle is struck from behind.