| Acronym | Definition |
|---|
| SEIN➣Stichting Epilepsie Instellingen Nederland (Dutch: Epilepsy Institutes Foundation Netherlands) |
| SEIN➣Sistema Eléctrico Interconectado Nacional (Perú) |
| SEIN➣State Employment Identification Number |
| SEIN➣Social and Environmental Impact Network (Aspen Institute Center for Business Education; now Corporate Governance Network) |
| SEIN➣Swiss Export Information Network (Switzerland) |
| SEIN➣Societal and Ethical Issues in Nanotechnology |
| SEIN➣Secondary Education in Nigeria (World Bank study) |
| SEIN➣Support Equipment Item Number |