In the US, why is ‘E’ skipped in grading is schools? Students can get A, B, C,D or F but not E, why?

Question

In the US, why is ‘E’ skipped in grading is schools? Students can get A, B, C,D or F but not E, why?

In: 875

Answer 1

Also, is a grade of “S” a real thing, or does it only exist in Japanese video games?