What does no special characters mean?

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Tags

1. #personal
2. #other
3. #strictly
4. #computer
5. #typing
6. #without
7. #special
8. #characters
9. #publisher
10. #permission
11. #desktop
12. #numeric
13. #alphanumeric
14. #prohibited
15. #character
16. #reproduction
17. #alphabetic
18. #encyclopedia
19. #definition