What is a signature in bookbinding?

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Tags

1. #bookbinding
2. #refers
3. #their
4. #folded
5. #bound
6. #through
7. #folds
8. #western
9. #sewing
10. #group
11. #binding
12. #together
13. #sheets
14. #neighboring
15. #signature
16. #linking
17. #section
18. #sections
19. #thread
20. #middle
21. #gathering