So I didn't really know where to post this so I figured the beginner area is as good a place as any. I don't really get into the HHT to much and really I only do it because it is fun or I am showing it to someone. I have been reading though in some posts that people will say that they honed their razor on whatever rock and then did the HHT and got a "HHT 4" or "passed level 3 HHT" or something like that.

As far as I have understood it, the HHT was when you took a hair brought it down to the blade and if it cut the hair then voila your blade or hair passes the test. I didn't know there were levels or variations. So what am I not getting here?