| Abbreviation | Definition |
|---|---|
| SESC | Systems Engineering Services Corporation |
| SESCO | San Angelo Electric Service Company |
| SESCO | Sarawak Electricity Supply Corporation |
| SESCO | Saudi Electric Supply Company |
| SESCO | Systems Engineering Support Company, Inc |
| SESI | Science And Engineering Services Inc |
| SESI | System Engineering Solutions Inc |
| SET | Sony Entertainment Television |
| SET | Specialized Expert Trainer |
| SETC | Sandhu Engineering Trading Company |
| SETC | State Express Transport Corporation |
| SETG | Solar Energy Technologies Group |
| SETG | Specialized Experts Task Group |
| SEUC | Samsung Electronics Ukraine Company |
| SEV | Sylvania Electronic Village |
| SEVC | Solar Electric Vehicle Company |
| SEW | Sliver and Elves World |
| SEWT | Suits Especially for Women Tailored |
| SF | Scott Foresman Publishers |
| SF | Shop Floor |