"Question: BB/100, BB/hr, what is this? Answer: BB/100 = "Big bets per 100 hands played" BB/hr = "Big bets per hour"
Note: This is big bets NOT big blinds. There's a big difference.
The first, BB/100, is used by PokerTracker to indicate how many big bets you're winning per 100 hands played according to the hands in its database. Since the number of hands played in an hour vary, and since the software knows exactly how many hands you've played, the "per 100" baseline is used to normalize your results.
The second measure, BB/hr, is generally used when playing in a live card room. Since you play many fewer hands live, and since you're probably not going to sit there and count how many hands you're actually playing, the "per hour" baseline is used to normalize your results.
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Copied from
http://poker.wikia.com/wiki/Beginner...00_and_BB.2Fhr