In reference to an airgun or BB Gun a BB is a small spherical metal pellet used as ammunition.

4 balls thrown outside the strike zone (and not swung at) and the batter gets to take first base (and he has the luxury of walking there, instead of huffing and puffing). Whatta country!

 X
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 |1---1  1st fret
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 ||234|
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  BFBDF
  b b

Notes:  1  : Bb
        3  : D
        5  : F

A musical symbol that approximates that of the double-flat.

The double-flat, in music terms, is a marker that only appears on notes not previously marked with an accidental (a key signature applied to a note is nullified). It causes the note to fall two half-steps lower musically, typically from a white key to its next lowest white neighbor. For example:

Ebb enharmonically equals D

Bbb with a Bb in the key signature enharmonically equals A

Cbb enharmonically equals Bb

Of course, one could technically have triple-flats and so forth, but besides being sadistic (or masochistic, depending on who the musician is), it is typically unneeded, unless one uses a key signature like Bbb major (A major), which (except in mental exercises in a music theory class) simply do not happen in real music. And yes, double flats can appear in key signatures.

The pen name of the author Denis Watkins-Pitchford. BB was born in 1905, lived in Northamptonshire and died in 1990.

BB wrote both children's and adult books and specialised in writing books on outdoor sports, fishing, hunting and nature. He is famous for his "scraper board" illustrations for both his own and many other authors books. He studied art in Paris and at the Royal College of Art in London.