A unit vector is a vector that, while it still has a magnitude and direction, is only significant in terms of its direction.
Unit vectors are often notated the same way as normal vectors, but with a circumflex (e.g. is the versor of a.)
In component form[change | change source]
Three common unit vectors used in component form are , and , referring to the unit vectors for the x-, y- and z-axes respectively. They are commonly just notated as i, j and k.
They can be written as the following: