Cq is for calling any station and "K" is used in morse. There are a lot of
Morse abreviations that are used. There are lots of lists out there of Q codes
and such that you should probably be able to download pretty easily. Handi-Hams
may have some of them available, too. When you start learing Morse you'll learn
a good bit of that stuff.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html