What is Apple's operating system called?

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Tags

1. #originally
2. #retain
3. #current
4. #major
5. #using
6. #apple
7. #macintosh
8. #number
9. #classic
10. #macos
11. #computers
12. #operating
13. #tenth
14. #version
15. #previous
16. #system
17. #arabic
18. #presented
19. #systems
20. #named
21. #numerals
22. #versions