[lywald]

The ISO standard recommends using a small space instead.

Numbers consisting of long sequences of digits can be made more readable by separating them into groups, preferably groups of three, separated by a small space. For this reason, ISO 31-0 specifies that such groups of digits should never be separated by a comma or point, as these are reserved for use as the decimal sign.

http://en.wikipedia.org/wiki/ISO_31-0#Numbers

[karli]

I did not knew that there is an ISO standard for this, will use it the next time, thank you!