[mrighele]

It's not much of the world, it about "the former British empire", and the world is more or less split in half (check the wikipedia link that one of the sibling comments posted)

I think that the best approach is to avoid to use comma or period as a thousand separator and just consider both of them as a decimal separator. It seems that the recommended approach for digit grouping is just a thin space [1], but since that character is not something that you can find on a regular keyboard and the regular space can be too wide, I think that one of the alternatives (like the apostrophe) is fine too. 169.216 or 169.216 can both be ambiguous , 169 216 and 169'216 or 169_216 much less

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