O with macron (Cyrillic)

O with macron is a letter of the Cyrillic script. In all its forms it looks exactly like the Latin letter O with macron.
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 O.