
Dal J. answered 11/25/14
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On google you can type "define B5" and you will get various answers.
B5 was the show Babylon 5 about ten years ago. There's also a boy band B5, a vitamin, a size of paper, and an agreement between astronomers as to what makes a planet (how Pluto got demoted).
If you give us a little more context, maybe we can help more. When and where did you hear it?

Dal J.
11/25/14