Division

In some countries, the symbol you don't use for division if you're over about 13 years old is ":". In others, the symbol you don't use for division if you're over about 13 years old is "÷".

Here we see Maurizio Codogno having to explain to his readers what ÷ means:

https://www.ilpost.it/mauriziocodogno/2019/08/12/ma-ci-importa-sapere-quanto-fa-8%C3%B7222/