| Abbreviation | Definition |
|---|---|
| EI | Engineering Index |
| EI | Engineering Information |
| EI | Engineering Instruction |
| EI | Engineering Intern |
| EI | Engineering Investigation |
| EIB | Engineering Information Bureau |
| EIC | Engineering Innovation Center |
| EICS | Engineering |
| EICS | Engineering Interactive Computing Systems |
| EICW | Engineering Institution for Civil Works |
| EIDC | Engineering Innovation Design Consulting |
| EIE | Electrical Instrument Engineering |
| EIE | Electrical Instrumental Engineering |
| EIED | Energy Industries Engineering and Design |
| EIEOS | Enterprise Infrastructure Engineering Operations Services |
| EIF | Engineering Information Foundation |
| EIG | Engineering and Installations Group |
| EIG | Engineering Installation Group |
| EIIS | Engineering Information Issuance System |
| EIOE | Electronic Information and Optical Engineering |