| Acronym | Meaning |
| PFM | Pulse Frequency Modulation |
| HVSF | Honeywelf Verification Simulation Facility |
| PC | Chamber Pressure |
| GS | Ground System |
| CMPTD | Computed |
| SCIU | Selector Control Interface Unit |
| OLDR | Quick Look Data Reference |
| R | Regulate |
| ES | Experiment Segment |
| HTC | Hybrid Technol Ogy ComPuter |