O with macron (О̄ о̄; italics: О̄ о̄) is a letter of the Cyrillic script. In all its forms it is homoglyphic with the Latin letter O with macron (Ō ō Ō ō).
O with macron are used in the Evenki, Mansi, Nanai, Negidal, Orok, Ulch, Kildin Sami, Selkup, and Chechen languages.
O with macron also appears in the Rusyn language in Ukraine, representing a close allophone of /o/. However, this letter primarily features in materials for beginning readers; the same sound is otherwise represented with the Cyrillic letter О.
Computing codes
See also O o : Latin letter O Ō ō : Latin letter Ō - an archaic letter in Latvian, and a letter in Latgalian, Livonian, Samogitian and Silesian. О о : Cyrillic letter О Cyrillic characters in Unicode
References