The Course Navigation indicator represents the number of changes in a course since your last visit. Currently, this feature is only used for Grades.
Course Navigation Indicators
Sometimes, it is helpful to know if anything has changed since the last time you have visited a course, especially with Grades. The numbered indicator for Grades shows either a change in a score, including new scores, or a comment left on a submission by an instructor or a peer.
To clear the indicators, view the Grades page. When you refresh the Grades page or navigate away from it, the count will reset.
Student View of Indicators
When you visit the Grades page in a course, you may see a blue dot next to an assignment. This indicates that the assignment was graded or commented on by your instructor or a peer. Remember, the indicators will disappear when you navigate away from this page or refresh it.