Yep. No pattern at all is just fluff or a bunch of scribble. Some people have a wiry "L" shape. Until I read about 4c I had no idea what type my hair was. 4b was too defined to be my hair type.
4c is Macy Gray at the end, there. http://www.curls.biz/curly-hair-type-guide.html http://www.curlyhairsalon.com/hairtypes.html 4c is mentioned at the bottom of this page: http://blog.treasuredlocks.com/2008/07/14/what-is-my-hair-type-2/
I've read it's just a suggested type but not all of us can use a Denman brush or any brush like it without causing some serious breakage.
Apparently there's also 5a-5c, too. 4c is a little like 5a-5c. Like the above blog says my hair will dry out in minutes no matter what I do, it will never shine no matter how long I deep condition or how much gel I apply, etc. And product as thick as butter is the only stuff that works for me. I *just* figured that one out.
I'm so glad there's more classifications because with the great variation in texture among black people alone there just has to be more than 4a and 4b at the end of the spectrum.