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based on an earlier version of the Wolfram Language.
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NumberPoint

NumberPoint
is an option for NumberForm and related functions which gives the string to use as a decimal point.
The default multiplier is a period:
Use a comma instead:
The default multiplier is a period:
In[1]:=
Click for copyable input
Out[1]//NumberForm=
 
Use a comma instead:
In[1]:=
Click for copyable input
Out[1]//NumberForm=
Use any string as a number point:
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