| Main sound category: | Diphthongs |
| Source vowel: | SoundCategory object (167) |
| Target vowel: | SoundCategory object (187) |
| IPA symbol: | io̞ |
| IPA description: | close front unrounded to mid back rounded diphthong |
| UPSID symbol: | io |
| UPSID description: | high front unrounded to mid back rounded diphthong |
| Occurs in | 2 languages |
| That is in | 0.41% of all languages |
| Occurs in: | Parauk Spanish (Castilian) |