What does mean in BNF?

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Tags

1. #computer
2. #syntax
3. #specify
4. #normal
5. #instruction
6. #procedure
7. #document
8. #language
9. #command
10. #required
11. #formatting
12. #applied
13. #protocols
14. #programming
15. #notation
16. #metasyntactic
17. #backus
18. #communication
19. #descriptions
20. #languages