Everyone knows Oxford, but the are many thousands of universities, most of which are not known to most employers. I am not an employer, but I work in higher ed

Everyone knows Oxford, but the are many thousands of universities, most of which are not known to most employers. I am not an employer, but I work in higher education and see transcripts of transferring and exchange students, and many (probably most) come with some kind of guide on how to interpret the grades, because there are a huge variety of ways of assigning them and defining them (e.g. at some universities a D is a fail, and at some a D is a pass - to know which you're looking at, you need a guide!).