Unit Vector
A unit vector is a normalized vector, that is to say it has a distance of 1.
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Description
A unit vector is a vector with a distance of 1. Any vector can be made into a unit vector, by normalizing it: a⃗/||a⃗||.
R3 space is commonly expressed as having the unit vectors î, ĵ, and k̂ which each have a distance of 1 in the directions of the X, Y, and Z axes respectively.