Hej fellows guixers,

I've been wondering this ever since I started using Guix. I tried looking for this in the manuals of both Guile and Guix but didn't find anything.

What does the percent sign in %output, %load-path etc mean?

I read in an article that it denotes a global variable, but I was unable to confirm it and am unsure if that's true or if there is some guix-related specialty to it. If it is a global variable, is this akin to the convention in Common Lisp to have asterisks for global variables?

Thanks for tips / suggestions!

Have a good day, fellows :)