O͘

O͘ is one of the six Taiwanese Hokkien vowels as written in the Pe̍h-ōe-jī (POJ) orthography. It is a normal o followed by dot above right, and is not to be confused with the Vietnamese Ơ. It is pronounced [ɔ].

History
The character was introduced by the Xiamen-based missionary Elihu Doty in the mid-nineteenth century, as a way to distinguish the Minnan vowels /o/ and /ɔ/ (the latter becoming ⟨o͘⟩). Since then it has become established in the Peh-oe-ji orthography, with only occasional deviations early in its usage – one example being Carstairs Douglas's 1873 dictionary, where he replaced the ⟨o͘⟩ with an o with a curl (similar to that of the English Phonotypic Alphabet).

In 1900s, the POJ letter was adopted to the Gooperland's languages and pronounced the same as the Taiwanese Hokkien. It is placed between O and P in alphabetical order. The letter O͘o͘ as the 20th letter in Eisatsu alphabet of 1915.

In 1982, the POJ letter was also adpoted to New Tai Azerbaijani Script, used in Gooperland.