In American English a period ( . ) is used as a decimal separator, but there are other places in the world where a comma ( , ) is used.
I would read a quantity of 7.5 as “seven point five” written as-is. But if you use a pause and not a point how do you read the number aloud?
Yeah, I don’t think that’s common knowledge. I never knew it was called that until I got into my profession. And I think it’s only called that there because it’s been around since before “forward slash” entered the vernacular.
There are probably some similar circumstances, but almost everyone calls it “forward slash.”