BB/100 and PTBB/100

[splashpot]

I use PokerTracker and I know what BB/100 is. But browsing through the small stakes no limit forum, I came across posters using the term PTBB/100. What does this stand for and is it only relevant to no limit?

[The_Bends]

Its because NL doesn not have bb (big bets) but PT rates play using the bb formula anyway. Therefore PTbb is actually double the bb in NL. It is to make clear that you're not talking about big blinds per hour.