[coldtea]

>i.e. the official metric system symbol is period or comma, regardless of what actual Europeans use.

Regardless? Those (and mainly comma) is exactly what Europeans use. It's not like there is some other symbol besides those too in use for that purpose.

[fastball]

Yes, there is another convention. (spaces)+(commas or periods) != (periods)+(commas)

What you are talking about is a European convention, not a metric convention. There is a difference.