Hair types and texture

I forgot all about this until recently. I'd be online and see someone arbitrarily mention that there hair is "4b" or something. And I'd think to myself ,"What? 4b, is that weave, color, an apartment number or something??" So today after another letter number hair description mention I said, "Dammit, I'm looking it up!" 

Type 1: Straight hair

Type 2: Wavy hair

Type 3 "Combo" hair
With sub-groups A,B and C to depict range

Type 4 Kinky coily hair
With sub-groups A,B and C to depict range

This site explains it well:
http://www.curlyhairsalon.com/hairtypes.html

I remember looking at something about this on a hair salon's site in NY. To do this test you have to observe how your hair acts with no products after being washed and air drying. I remember that much. Now I can say the PLATINUM HOBO is either a 3C or 4A or somewhere in between.