What is a circle with a diagonal line through it?

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Tags

1. #surrounding
2. #symbol
3. #right
4. #permitted
5. #diagonal
6. #prohibition
7. #running
8. #universal
9. #something
10. #circle
11. #through
12. #known
13. #pictogram
14. #english
15. #bottom
16. #interdictory
17. #backslash
18. #indicate