little b

b
1. abbreviation, mean born, billion,bass or basso.
2. Physics barn(s), a unit of area, 10−28 square meters, used esp. in particle physics.
3. the second letter of the alphabet.
4. the second highest class of academic mark.
5. Chess denoting the second file from the left, as viewed from White's side of the board.
6. the second constant to appear in an algebraic equation.
7. the chemical element boron.