Do you put a period after abbreviations?

Related questions

1. Do we need comma before etc?
2. What causes cruise control to stop working?
3. Does ECT change your personality?
4. How do you use etc?
5. Is it safe to drive with a bad throttle position sensor?
6. What is ETC in timesheet?
7. How much does it cost to fix a throttle position sensor?
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9. What is stand for etc?
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Tags

1. #mister
2. #known
3. #period
4. #english
5. #first
6. #little
7. #putting
8. #american
9. #between
10. #letter
11. #writers
12. #however
13. #after
14. #periods
15. #written
16. #abbreviations
17. #british
18. #difference
19. #distinction
20. #doctor