What does 7.2 surround sound mean?

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Tags

1. #video
2. #called
3. #support
4. #frequencies
5. #subwoofers
6. #otherwise
7. #supporting
8. #surround
9. #specialized
10. #speakers
11. #audio
12. #channels
13. #sound
14. #output
15. #effects
16. #known
17. #frequency
18. #which
19. #indicates
20. #handle
21. #receiver