usually, CCL = Clozure Common Lisp, and not Corman CL.

[1]: https://www.clozure.com/ccl/

The linked to article makes the argument Corman CL is a more approachable code base and also that the IDE makes it a bit more beginner friendly than Emacs w/ SLIME w/ SBCL or CCL (Clozure CL).