^ They also use numbers. In Scotland the GCSE equivalent Standard grades at 16 are in number order with 1-5, and of course degree courses with First, Second (Upper/Lower), Third...
We use a 0-10 system in all schools. Ten is maximum. It's actually 2-9 or 2-10 depending on the teacher, but anyway.
At university there is a 0-30 system instead.
I think you'll find English is the language for MAP, whether there is a hard and fast rule about punctuation beyond no text speak and swearing is another thing.