Yes, period for digit separator is a thing in many countries, including Russia, we were taught that way in school [1]<p>It was a little bit inconvenient when I started programming, but nothing too major.<p>Interface for money and many other things is a solved problem: we have locale settings for that in operating systems and software that respects them, works just fine.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Decimal_mark#Examples_of_use" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Decimal_mark#Examples_of_use</a>