🚀 go-pugleaf

Someone asked me this question, and I am somewhat at a loss.  As a mass 
communications major, I was taught this some time ago; but, as I am but a 
rolling cannon, memory escapes me!

For radio and television stations east of the Mississippi (I think -- can't 
even rememeber what the exact dividing line is, but anyway . . . ), call 
letters are preceded with a "W".  This originally stood for Westinghouse 
Broadcasting, I believe.

What does the "K" stand for which prefixes stations to the west of the 
Mississippi (or whatever the dividing line is)?

Thank you very much in advance!  I am stumped.