I just found this one dollar bill in my wallet, turns out the serial is a trinary bill consisting only of 7s 6s and 0s.
Not bad. Keep on the lookout for more of these. Amass a large collection and you'll get a good premium over face value, regardless of condition (to the right buyer...)
I've heard the term Trinary, I think it was eBay hype because the note had nothing else going for it. I don't know anyone that collects them. If you like it then keep it, but I don't see any premium on it now or down the road.