[sllabres]

this usage of the decimal separator is not a German thing only [1] and globally not very consistent.

One third of the world seems to use ".", the other third "," and the others decides with own rules or have own symbols. (Space, "'" and "·" and "_" in many variants).

[1] https://en.wikipedia.org/wiki/Decimal_separator#Conventions_...

[card_zero]

I like the idiosyncratic Indian digit grouping where you start with a group of three and group the rest of the number in pairs, it's very creative.