Are periods after numbers of a list an international convention?

1. Do some countries use periods instead of commas in numbers?
2. Why do Europeans use commas instead of periods in numbers?
3. Why do some countries use commas instead of decimals?

Do some countries use periods instead of commas in numbers?

Great Britain and the United States are two of the few places in the world that use a period to indicate the decimal place. Many other countries use a comma instead. The decimal separator is also called the radix character.

Why do Europeans use commas instead of periods in numbers?

In the early 1700s, Gottfried Wilhelm Leibniz, a German polymath, proposed the dot as the symbol for multiplication. Therefore, most of Europe favored the comma as a decimal separator.

Why do some countries use commas instead of decimals?

It is convention. Anglo-Saxon countries and those influenced by them (such as Japan) use the decimal point and thousands comma (some use a space).