"Trajectory lines" refer to the path or trajectory that an object or a particle follows through space. These lines show the direction and movement of the object as it travels. Full definition
There's also a bird's - eye view that pieces images together from four cameras mounted around the car, complete with trajectory lines so you can see exactly where you're aiming. (digitaltrends.com)
I did have a rear view camera, which included trajectory lines. (cnet.com)
We had a rear camera with dynamic trajectory lines and that's about it. (cnet.com)