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.
AFK may refer to:  1 AFK, a song on Pinback's 2004 album Summer in Abaddon. 2  Angamaly railway station, in India. 3  Ashford International railway station, in the United Kingdom.  Away from keyboard, Internet slang for real 1  life. Nanubae language.  Nebraska City Municipal Airport.