
The roof support between a car's rearmost side window and its rear window. On a vehicle with four side pillars, the rearmost roof support may be called a D-pillar.
Found on
http://www.caranddriver.com/reviews/glossary-of-terms-info

The roof support between a vehicle's rearmost side window and its rear window. Also known as a C-Post. On a vehicle with four side pillars, the rearmost roof support may be called a D-pillar.
Found on
https://www.encyclo.co.uk/local/22334

The vertical metal roof support between the side edge of the rear windshield (also called the backlight) and the rear edge of the rear window.
Found on
https://www.encyclo.co.uk/local/22335
No exact match found.