What does exclamation point mean in Linux?

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Tags

1. #otherwise
2. #message
3. #shell
4. #executes
5. #refers
6. #event
7. #number
8. #displays
9. #relative
10. #example
11. #negative
12. #point
13. #current
14. #command
15. #references
16. #history
17. #following
18. #error
19. #exclamation