Please see this document for more the most up to date codes and more detailed information.
| Glenbrook Code | Description | Presence |
| Present | Present | |
| AT | Athletic Waivers | NA |
| Late | Late | Present |
| T | Tardy (< 5 min) | Present |
| AD | Adm-admin | Present |
| EM | Exm-testing | Present |
| FT | Fdt-Field Trip | Present |
| HB | Hmb-Home Bound | Present |
| IL | Ill-illness | Absent |
| CR | Cre-coll Rep | Present |
| LC | Lac-lac | Present |
| ME | Med-medical | Absent |
| NU | Nur-nurse | Present |
| EX | Excused | Absent |
| RE | Rel-religious | Absent |
| OS | Sus-suspended | Absent |
| X | Unx-unexcused | Absent |
| X1 | X1 | Absent |
| X2 | X2 | Absent |
| X3 | X3 | Absent |
| XX | X3+ | Absent |
| UP | Updated Excused | Absent |
| PR | Bereavement | Absent |
| MNHD | Mental Health Days | Absent |
| OO | Exam Opt-Out / Test Exempt | Absent |
| P | Present In The Building | Present |
| RL | Remote Learning | Present |
| RP | E-Learning | Present |
| MB | Marching Band Waviers | Present |
| EL | Excused Late | Present |
| CE | Civic Engagement | Present |
| IC | Internship Course | Present |