Acronym |
Definition |
| HIEO | Highly Inclined Elliptical Orbit |
| HLO | High Lunar Orbit |
| HLS | Human Landing System |
| HOLO | High Orbit Low Opening |
| HUAC | Hybrid Underwater-Aerospace Craft |
| IAE | Intergalactic Aerospace Expo |
| IAI | Israel Aerospace Industries |
| IART | Intelligent Aerospace Radar Team |
| IAU | Indiana Aerospace University |
| ICO | Intermediate Circular Orbit |
| IDO | Infinite Disjoint Orbit |
| IDOC | Infinite Disjoint Orbit Condition |
| IDSS | Integrated Defence and Space System |
| ILA | Innovation and Leadership in Aerospace |
| IMS | International Monitoring System |
| INSIGHT | Interior Exploration using Seismic Investigations, Geodesy and Heat Transport |
| IOCR | In Orbit Commissioning Review |
| IOD | In Orbit Demonstrator |
| IOD | In Orbit Demonstration |
| IOD | Interactive Orbit Determination |
| IOV | In Orbit Validation |
| IRB | "I Read Books"- Elon Musk |
| ISBO | Innermost Stable Bound Orbit |
| ISCO | inner–most stable circular orbit |
| ISRO | India Space Research Organisation |
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