Several codes are used in class either on the whiteboard or included on the grade printouts. I have listed some of them below.
H/W - Homework
W/S - Worksheet
S/B - Should Be
Inc. - Work is Incomplete
Grade reports
NG - Not Graded or No Grade. This may be used to indicate that an upcoming project is due or that a child was absent and has not submitted the work or simply that the assignment's grade has not been recorded.
XC - Extra Credit assignment. These are recorded as 0 points possible and reflected in the report as a specific number of points above the 0 points possible. It does not count against a student who has chosen not to complete extra credit.
EX - Excused. This is the grade if a student was not present (due to an excused absence) for a lab that can not be made up.
missing - The assignment is given a 0 because it was never submitted or was submitted more than one day late and can not be made up.