What does M mean in Rubik's Cube?

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Tags

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