bucket seat: side view
adjustment knob 
The seat’s regulating mechanism, for changing the angle of the backrest to an almost horizontal position.
seat 
Horizontal unit for a passenger to sit on.
seat belt 
Safety device fitted with sliding straps, keeping the passenger in the seat in the event of an accident.
backrest 
Part of the seat supporting the back.
headrest 
Safety pad placed behind the passenger’s head to protect the cervical vertebrae in the event of impact.