Duden or DIN standard DIN 5008), and in the different versions of English (UK, Canada, South Africa, etc.). Please note that there are different conventions when it comes to writing numbers, both in German (e.g. In both German and in US/UK English, commas and points are used they are, however, placed differently in the two languages.
When writing figures, German speakers sometimes forget that the symbols used are different in German and English. One of the most common mistakes I see when proofreading bilingual annual reports (German/English) is that the periods and commas are placed incorrectly as delimiters in numbers and figures.
