Vectors which represent the rotational effect and acts along the axis of rotation are called Axial vectors.
Eg: Angular velocity, torque, angular momentum, ect.,
A vector with zero magnitude and having an arbitrary direction is called a null vector.
The two or more vectors are said to be collinear, when they act along the same lines or parallel lines.
The two or more vectors are said to be coplanar if the vectors lying in the same plane.