I'm an American living in Germany. When I first arrived, the way Germans write the digit 1 surprised me. They write it with the upper hook thing very long, almost like a capital lambda (Λ), which sometimes makes 1 and A visually ambiguous. This isn't really a problem, just something funny about moving to a new country.
I use 1 with a long hook except when I write binary numbers where I use just a | for 1.
I have some other context dependent characters/letters.
I write small z like that in normal writing, but as a mathematical variable I write it as ƶ. (To disambiguate from 2.)
I write small t like † in normal writing, but as a mathematical variable I write it as t. (To disambiguate from + (plus).)
I write q like that in normal writing, but as a mathematical variable I write it with a stroke, which does not display on the iPhone, a ꝗ, a bit similar to a ɋ. (To disambiguate from a (ɑ).)
It’s all about disambiguation, and sometimes having different letter shapes for isolated characters.
