| Abbreviation | Designation | |
|---|---|---|
| SE | Southeastern | railway company |
| 74 / SE | Sverige, Konungariket Sverige (Swedish) Sweden, Kingdom of Sweden | country code |
| .se | Sveriges län (Swedish) Provinces of Sweden | country code |
| SE | Stadt-Express (German) | train category |
| S.E. | société européenne (France) European company | organization |