 Since every unit vector can be thought of as a point on a unit sphere, and since a versor can be thought of as the quotient of two vectors, a versor has a representative great circle arc, called a vector arc, connecting these two points, drawn from the divisor or lower part of quotient, to the dividend or upper part of the quotient.When the arc of a versor has the magnitude of a right angle, then it is called a right versor, a "right radial" or "quadrantal versor".There are two special degenerate versor cases, called the unit-scalars.