Here is a list of countries where commas are commonly used to indicate decimals:

1. Albania
2. Argentina
3. Austria
4. Belgium
5. Bosnia and Herzegovina
6. Brazil
7. Bulgaria
8. Chile
9. Croatia
10. Czech Republic
11. Denmark
12. Estonia
13. Finland
14. France
15. Germany
16. Greece
17. Hungary
18. Iceland
19. Indonesia
20. Italy
21. Latvia
22. Lithuania
23. Luxembourg
24. Montenegro
25. Netherlands
26. Norway
27. Poland
28. Portugal
29. Romania
30. Russia
31. Serbia
32. Slovakia
33. Slovenia
34. Spain
35. Sweden
36. Switzerland
37. Turkey
38. Ukraine

Decimal point vs. decimal comma: The choice between a decimal point (.) and a decimal comma (,) as a separator for decimals is largely influenced by regional conventions and language usage. In English-speaking countries and many others, the decimal point is used, while in several European countries, the decimal comma is preferred.
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