What is the correct way to write PS?

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Tags

1. #means
2. #letters
3. #needs
4. #written
5. #capital
6. #periods
7. #which
8. #abbreviation
9. #derived
10. #after
11. #indicate
12. #apparently
13. #stops
14. #latin
15. #words
16. #postscript
17. #scriptum
18. #should