How do you abbreviate AM and PM?

Related questions

1. What is PM full?
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3. Is PM in the morning?
4. How do you greet at 12pm?
5. Is it 12 AM or PM?
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7. Is 12/30 Afternoon AM or PM?
8. Where is PM on Facebook?
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10. What is difference between PM and AM?

Tags

1. #requires
2. #periods
3. #style
4. #common
5. #chicago
6. #lowercase
7. #generally
8. #writing
9. #there
10. #first
11. #recommend
12. #these
13. #accepted
14. #abbreviations
15. #letters
16. #write