Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
Axial and radial both intersect the center of rotation, but the axial direction is perpendicular to all radial directions. When the body rotates, its axis is unmoved by the rotation. Example: Imagine he tip of a sharp pencil at the top center of a hockey puck.