What does 3V3 or 1V8 mean?
I've always been told that the reason for using letters or symbols in place of the decimal point is neither for international relations or variable names in code but for clarity in print. The issue being that when datasheets were typed up, or schematics drawn, and then copied/photocopied/faxed/etc the dot may get dropped.

This issue obviously isn't such a big deal these days but using 3V3 or 4R7 is still pretty common. It's really common in older documentation here in the UK (and I'm talking back to kind of era where we really wouldn't have creating documents with legibility to Germans in mind...).

I'm pretty happy transposing commas for full stops in European documents, it's fairly common to find them in European publications (even when they've been translated to English).