Sure! There are several countries around the world where commas are used to indicate decimals. Here is a list of some countries where this notation is commonly used:

1. Germany
2. Austria
3. Switzerland
4. Netherlands
5. Belgium
6. Italy
7. France (in some contexts)
8. Spain (in some contexts)
9. Portugal (in some contexts)
10. Greece (in some contexts)
11. Latin American countries influenced by Spanish (e.g., Mexico, Argentina, Colombia, etc.)

It's worth noting that the use of commas as decimal separators is just one of the many numerical notations used worldwide. The development of different numerical notations can be attributed to various historical, cultural, and linguistic factors.

The decimal point notation, which uses a dot (.) as the separator, is widely used in English-speaking countries and has its origins in the Arabic numeral system. This system was introduced to Europe during the Middle Ages and gradually gained popularity.

On the other hand, the use of commas as decimal separators has historical roots in continental Europe. The adoption of commas can be traced back to the influential work of mathematicians and scholars like Simon Stevin from the Netherlands and François Viète from France, who advocated for their use in the 16th and 17th centuries. These countries, along with others in continental Europe, eventually adopted the comma as the decimal separator.

Different countries also have varying conventions for grouping digits in large numbers. For instance, while English-speaking countries typically use commas (e.g., 1,000,000), some countries like Germany and Austria use periods (e.g., 1.000.000). These differences reflect the diverse historical and cultural influences on numerical notation.

It's important to remember that numerical notations can vary even within countries, depending on the context and the specific field of use (e.g., scientific notation, financial notation, etc.).
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