What does tattoo dots on knuckles mean?

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Tags

1. #forefinger
2. #tattooed
3. #prison
4. #knuckles
5. #mostly
6. #sentence
7. #thumb
8. #elsewhere
9. #meaning
10. #their
11. #bastards
12. #going
13. #coppers
14. #between
15. #stand
16. #completed
17. #across