Quote Originally Posted by Hazir View Post
1. I am not American
2. this is the official notation
You're writing in English right now? Then you use a dot as a decimal mark, comma as a thousands separator. Nothing to do with "official" or "american".

And the "official" recommendation, by the way, would be to use a space as a thousands separator.

Numbers may be divided in groups of three in order to facilitate reading; neither dots
nor commas are ever inserted in the spaces between groups
http://www.bipm.org/utils/en/pdf/Resol22CGPM-EN.pdf