What does I mean in terms of grades?

In terms of grades, "I" typically stands for "incomplete." This designation indicates that a student has not finished all course requirements by the end of the grading period, often due to extenuating circumstances. An incomplete grade usually allows the student a specified time frame to complete the outstanding work before a final grade is assigned. It's important to follow up with the instructor regarding the requirements and deadlines associated with an "I" grade.