Versor n. : The turning factor of a quaternion.

Example:


Taxonomy
versor, versors, quaternion, hyperbolic, arc, great-circle, vector, unit vector, quaternion algebra, Elements of Quaternions, theory, algebra, axis, free encyclopedia, Hamilton, pole, elements, product.

Defination from the web:
versor is a directed great-circle arc that corresponds to a quaternion of norm one. In geometry and physics, a versor is sometimes defined as a unit vector indicating the orientation of a directed axis (such as a Cartesian axis) or of another vector. ...