What does exit code 255 mean?

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1. #event
2. #anything
3. #posix
4. #scripts
5. #return
6. #success
7. #systems
8. #machine
9. #adapt
10. #interpreted
11. #number
12. #executable
13. #parent
14. #standard
15. #known
16. #successes
17. #codes
18. #sometimes
19. #process
20. #failures
21. #returned