displacement

The vector that takes you from one point to another: `displacement = end − start`. Unlike a position (which depends on where the origin sits), a displacement is _coordinate-free_ in spirit — moving the origin doesn't change the displacement between two points. Velocity is displacement per unit time; force is something that changes velocity (and thus, eventually, displacement). When physicists, graphics designers, and ML engineers all "subtract two points," what they get back is a displacement vector — the same object in three costumes.