Why is the C pillar on a car called the sail panel?

The C pillar on a car is often referred to as the sail panel because of its shape and positioning, which resembles a sail on a boat. This vertical or slightly angled section of the car's body helps provide structural support while also contributing to the vehicle's aerodynamics. Additionally, the sail panel typically houses Windows that enhance visibility for rear passengers. Its design is essential for both aesthetics and functionality in automotive styling.