Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface. Reflectances of room surfaces are used in determining coefficient of utilization values for luminaires.
The last three lines show you how to define your own awk function. The format is simple -- type function, then the function name, and then the parameters separated by commas, inside parentheses. After this, a { } code block contains the code that you'd like this function to execute.
Definition of hock. 1  1a : the tarsal joint or region in the hind limb of a digitigrade quadruped (such as the horse) corresponding to the human ankle but elevated and bending backward â see horse illustrationb : a joint of a fowl's leg that corresponds to the hock of a quadruped.