NumberSeparator

is an option for NumberForm and related functions that gives the string to insert at breaks between digits.

Details

NumberSeparator->"s" specifies that the string s should be inserted at every break between digits specified by DigitBlock.
NumberSeparator->{"sleft","sright"} specifies different strings to be used on the left and right of the decimal point.
The default setting is NumberSeparator->{","," "}.
NumberSeparator can also be used to specify the strings to assume for breaks between digits with Interpreter["Number",…].

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The default separator is a comma (,):

Use spaces instead:

Interpret numbers with a custom separator:

Specify different separators to the left and right of the number point:

The default number separators and number point:

Switch the role of periods and commas in the representation:

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