Random 6-character sequence in Cap's about me.

I was just watching a video, and decided to check the about me, because I wanted to see the total view count. Anyway, it goes like this:

CB8MT8

If you check his about me, that's what it is. I haven't seen anyone else mention it anywhere online (though I haven't checked *much*, just a few popular websites)

I figured that if anyone would know, it might be this sub.