good amount for a 1/2 player??

[JungleJim]

i see the term bb/100 hands and was just wondering if someone could please explain this to me.

i play 1/2 on stars and now full tilt and do fairly well. i play anywhere from 2 - 4 tables and avg. $100 profit on each table for anywhere from 3- 6 hrs. is this a good profit ratio for the tables and time played? i feel like i should/could be making much more on each table.

thx.

JungleJim