| Abbreviation | Definition |
|---|---|
| ECF | Element Charge Factor |
| ECF | Equivalency Capability File |
| ECHO | Educational Concerns For Hunger Organization |
| ECI | Earth Centered Inertia |
| ECIO | Experiment Computer Input/Output |
| ECL | Entry Closed Loop |
| ECLS | Environmental Control and Life Support |
| ECM | Engine Control Module |
| ECN | Engineering Change Notice |
| ECO | Earth Communications Office |
| ECO | Engine COmbustion |
| ECO | Engine CutOff |
| ECOS | Experiment Computer Operating System |
| ECP | Electronic Control Panel |
| ECP | Explicitly Coded Program |
| ECRA | Engineering Change Request/Authorization |
| ECS | Engine Control System |
| ECS | Environmental Control System |
| ECS | EOF (Experimenters Operations Facility) Core System |
| ECS | EOSDIS (Earth Observing System Data and Information System) Core System |