Adding the degree symbol in math quill would be very helpful in creating assessments for geometry. The "deg" option is there, but it is would look better seeing the degree bubble instead.
Comments from Instructure
Please see the comment from @dlyons for more details regarding this request.
@kdelzotti, the responsive equation editor coming to Canvas (and this year to new quizzes) contains the degree symbol, currently under the "Misc" tab. You can see it now on Beta and soon in Production.