What does orphan work mean on ao3?

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Tags

1. #writer
2. #permanently
3. #orphan
4. #ability
5. #disassociate
6. #fanwork
7. #clicks
8. #account
9. #pseud
10. #offered
11. #archive
12. #specially
13. #detaches
14. #hosted
15. #attaches
16. #which
17. #feature
18. #created
19. #their