Assignment Status Icon Key located on the Overview page; icons and their meanings.
Reminder: These icons are located at the top of the Overview page when you are signed in to your Thinking Nation teacher account.
This icon indicates that you have an assignment scheduled to post at a later date.
This icon indicates that you have posted an assigned DBQ or Formative Assessment that is active but the student has not yet opened or viewed it.
This icon indicates that the student has opened the assignment and has started working on it.
This icon indicates that the student has submitted their assignment, but it is not yet graded (it is in the grading que).
These icons indicate each student's personal score on their assignment.
Note: 
This icon indicates how many assignments have been graded on the Overview page.
Here is a quick video explaining each icon: