@christianp I vaguely recall that we used % for ’correct’ and v or ✔️ for ’incorrect’ (’väärin’ in Finnish) in primary school. That’s very odd, because I’ve never seen those notations again.
@christianp The Wikipedia page for ”check mark”, and apparently Unicode, contain the correct form of %; not the literal percent sign (they look the same in my handwriting). Still, I feel that the English version has largely killed off that symbol.