The length (or magnitude) of the vector is square root of (x*x+y*y+z*z). Following the traditional mathematical rules for vectors, vectors are always considered as a ray passing from the origin of <0,0,0> through the point described in the vector <x,y,z>

The unity documentation on this is found here.

The length (or magnitude) of the vector is square root of (x*x+y*y+z*z). Vectors are always considered as a ray passing from the origin of <0,0,0> through the point described in the vector <x,y,z>

The unity documentation on this is found here.