| A | credit was given for the course without the student's enrolling in the course (credit by examination, advanced placement, etc.). |
| B | by re-examination |
| C | independent studies (correspondence) |
| E | extension (off-campus) |
| R | course repeated without penalty or first year course repeat |
| 0 | course will not accumulate to any totals |
| 1 | graduate |
| 3 | special |
| 4 | veterinary medicine |
| 5 | professional |
| 6 | Agricultural Institute |
| I1 | interinstitutional (University of North Carolina-Chapel Hill) |
| I2 | interinstitutional (University of North Carolina-Greensboro) |
| I3 | interinstitutional (University of North Carolina-Charlotte) |
| I4 | interinstitutional (Duke University) |