| ISO 639-3 Inverted Names | art-291 |
| Undetermined | |
| ISO 639-3 | art-001 | und |
| ISO 639-2/T | art-002 | und |
| ISO 639-2/B | art-003 | und |
| ISO 639-3 Reference Names | art-289 | Undetermined |
| ISO 639-3 Print Names | art-290 | Undetermined |
| English | eng-000 | Undetermined |
| français | fra-000 | indéterminée |
| русский | rus-000 | неидентифицированный |
| español | spa-000 | indeterminada |