| Main sound category: | Diphthongs |
| Source vowel: | SoundCategory object (187) |
| Target vowel: | SoundCategory object (167) |
| IPA symbol: | o̞i |
| IPA description: | mid back rounded to close front unrounded diphthong |
| UPSID symbol: | oi |
| UPSID description: | mid back rounded to high front unrounded diphthong |
| Occurs in | 8 languages |
| That is in | 1.63% of all languages |
| Occurs in: | !Xu Dani Fijian Kiowa Kurdish Kven Parauk Spanish (Castilian) |