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Decimal value
You can write a decimal value in a variety of ways.
Explanation
There are many countries where commas (decimal point) and points are used otherwise. So you can write
There are calculators where you can change the display settings for point and comma. If there are many decimal digits, there are different notations possible
If there are no digits before the comma you can write a zero or a dash, or you just skip it
To make it clear that the decimal numeral system is being used you can indicate this with an index
Clarity is important.