| Acronym | Meaning |
| STU | Star Tracker Unit |
| LN2 | Liquid Nitrogen |
| O | Engineering Order |
| VIB | Vertical Integration Building |
| PS | Payload Support |
| OCF | Orbiter Computational Facilities |
| NDI | Nondestructive Inspection |
| EL | Electromagnetic Interference |
| NHA | NNHA Next Higher Assembly |
| OFM | Original Equipment Manufacturer |