| Abbreviation | Definition |
|---|---|
| ICR | Instruction Change Request |
| ICR | Interface Compatibility Record |
| ICS | Instrumentation Control System |
| ICS | Integrated Checkout Station |
| ICS | Inter-Communication System |
| ICS | Interface Control Specification |
| ICS | Interpretive Computer Simulator |
| ICSO | International Conference on Space Optics |
| ICST | Information, Communication, and Space Technology |
| ICT | Influence Coefficient Test |
| ICT | Interface Control Tooling |
| ICTC | Inertial Components Temperature Controller |
| ICU | Ignition Control Unit |
| ICW | Interrupted Continuous Wave |
| ID | Identification Data |
| ID | Idle Format |
| ID | Inside Diameter |
| ID | Interface Document |
| ID&CA | Inverter Distribution and Control Assembly |
| IDA | Interface Display Assembly |