Double monocular O
Double monocular "O" is a rare form of the Cyrillic letter О. It was used in Old Russian on the word “eyes”, like this: ꙭчи. It has 3 Cyrillic cousins, Binocular, Monocular and Multiocular O linked below, each of its cousins can be used in words related to "eyes". (ꙩ monocular) (ꙫ binocular) (ꙮ multiocular)
Double Monocular O Media
St. Olga icon at St Volodymyr's Cathedral, Kyiv. The letter can be seen in the inscription above her left shoulder.