| Abbreviation | Definition |
|---|---|
| HP | Perigee Altitude |
| HPAS | High Performance Adhesive System |
| HPF | Horizontal Processing Facility |
| HPF | Horizontal Processing Facility (O&C) |
| HPFD | High Pressure Fuel Duct |
| HPFTP | High Pressure Fuel TurboPump |
| HPG | High Pressure Gas |
| HPGS | High Pressure Gas System |
| HPI | High Performance Insulation |
| HPOP | High Pressure Oxidizer Pump |
| HPOT | High Pressure Oxidizer Turbopump |
| HPOTP | High Pressure Oxidizer TurboPump |
| HPPF | Horizontal Payloads Processing Facility |
| HPR | Hydrogen Pressure Regulator |
| HPRV | Hydrogen Pressure Relief Valve |
| HPS | Hydraulic Power System |
| HPT | Heading, Pitching, and Twisting |
| HPT | High Pressure Test |
| HPU | Hydraulic Power Unit |
| HPV | High Pressure Valve |