What does the "Spaceship" symbol mean when it appears in the Canvas Grade Book ?
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The "spaceship" icon in the gradebook means that a Quiz submitted, not fully graded (contains questions that must be manually graded, or an auto-submitted quiz score has been deleted and needs to be reassigned); can also display if a quiz has been edited and includes major changes that affect the quiz score, such as deleting questions or deleting quiz answers, and requires a grader to manually resolve.
See: How do I use the icons and colors in the Gradebook?
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