| Description | Notes | |
|---|---|---|
| EN | Code for undetermined script | — |
| FR | Codet pour écriture indéterminée | — |
| ES | Código para sistemas de escritura no determinados | — |
List 121 · Text script – based on ISO 15924
Zyyy — Code for undetermined script
<!-- ONIX snippet not yet curated for codelist 121 (value: Zyyy) -->- Introduced in Issue 9