What does B mean in Rubik's Cube Algorithms?

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Tags

1. #clockwise
2. #notation
3. #describe
4. #front
5. #rotation
6. #rubik
7. #followed
8. #means
9. #letter
10. #apostrophe
11. #puzzle
12. #every
13. #itself
14. #degree
15. #operations
16. #right
17. #counterclockwise