| Acronym | Sense | Language | Topics |
|---|---|---|---|
| SEK | Svenska Elektriska Kommissionen | In Swedish | → Electrical engineering → Sweden |
| SEK | Seula Esperanto-Kulturcentro | In Esperanto | → Civilization, culture, progress → Artificial languages (linguistics) |
| SEK | Sorocaba Esperanto-Klubo | In Esperanto | → Organizations and associations → Artificial languages (linguistics) |