- normalized vectors are a succinct way to represent a direction in space, whether it be 1D, 2D, 3D, or any other D. I'll only add that they are called versors

- normalized vectors are a succinct way to represent a direction in space, whether it be 1D, 2D, 3D, or any other D. I'll only add that they are called versors and one can read more about their magic in any material about quaternions.