O with macron (Cyrillic)
Not to be confused with the Latin letter Ō
O with macron (О̄ о̄; italics: О̄ о̄) is a letter of the Cyrillic script. In all its forms it looks exactly like the Latin letter O with macron (Ō ō Ō ō).
O with macron is used in the Evenki, Mansi, Nanai, Negidal, Orok, Ulch, Kildin Sami, Selkup, Chechen languages.