What does 0x80 mean?

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1. #language
2. #compatible
3. #linux
4. #machine
5. #called
6. #system
7. #processing
8. #intel
9. #central
10. #definition
11. #human
12. #notation
13. #readable
14. #processor
15. #processors
16. #calls
17. #specific
18. #assembly
19. #invoke
20. #instruction