I keep seeing people mention “K Agency” and “K community.” What dioes “k” mean here?

Also:

Maybe TER needs it's own new song to help out with this.  
.
http://www.youtube.com/watch?v=lu1-YlLpO1Q
A, you're adorable
B, you're so beautiful
C, you're a cutie, full of charm
D, you're a darling
And E, you're exciting
And F, you're a feather in my arm
G, you look good to me
And H, you're so heavenly
I, you're the one I idolize
J, we're like Jack and Jill
K, you're so kissable
L, is the love-light in your eyes
[Bridge]
M, N, O, P
I could go on all day
Q, R, S, T
Alphabetically speaking, you're okay
.
And U made my life complete
And V means you're very sweet
W, X, Y, Z
It's fun to wander through
The alphabet with you
To tell you what you mean to me