what is the deal with a GL

[poor boy]

okay, i've been with the vdub hobby going on 20 years now. as i've been moving in the direction of performance over the last couple years, i've been reading more and more about german look and the kafer cup series which kinda go hand in hand.

my question is: what is the deal about a GL car? what does this mean? i have a 69 standard right now moving in the direction of what i like in german look, however, the GL thing escapes me. enlighten me, please.