What do the slashes on a Zippo mean?

Related questions

1. Can you use charcoal fluid in a Zippo?
2. What do the letters and numbers on the bottom of a Zippo mean?
3. How long is a Zippo Wick?
4. How long can a Zippo stay lit?
5. Do you have to use Zippo lighter fluid in a Zippo?
6. What is the most expensive lighter?
7. What do I do if my Zippo won't spark?
8. How long does a Zippo flint last?
9. What is the liquid inside a lighter?
10. Do zippos come full?

Tags

1. #control
2. #style
3. #pending
4. #stamp
5. #appearance
6. #identified
7. #provides
8. #fabricated
9. #bottom
10. #lighters
11. #marks
12. #quality
13. #between
14. #zippo
15. #model
16. #patent
17. #original
18. #lighter
19. #purpose
20. #another
21. #dating