The direction from an object A to another object B can be specified as a vector v=AB^-> with tail at A and head at B. However, since this vector has length equal to the distance between the objects in addition to encoding the direction from the first to the second, it is natural to instead consider the unit vector v^^ (sometimes called the direction vector), which decouples the distance from the direction.

See also

Head, Tail, Unit Vector, Vector

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Cite this as:

Weisstein, Eric W. "Direction." From MathWorld--A Wolfram Web Resource.

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