Uppercase Cyrillic O with umlaut dots, used in Komi, Altai, Khakas and other minority alphabets.
U+04E5CYRILLIC SMALL LETTER I WITH DIAERESISU+04E7CYRILLIC SMALL LETTER O WITH DIAERESISU+04E4CYRILLIC CAPITAL LETTER I WITH DIAERESISU+04E8CYRILLIC CAPITAL LETTER BARRED OU+04E3CYRILLIC SMALL LETTER I WITH MACRONU+04E9CYRILLIC SMALL LETTER BARRED OU+04E2CYRILLIC CAPITAL LETTER I WITH MACRONU+04EACYRILLIC CAPITAL LETTER BARRED O WITH DIAERESISU+04E1CYRILLIC SMALL LETTER ABKHASIAN DZEU+04EBCYRILLIC SMALL LETTER BARRED O WITH DIAERESISU+04E0CYRILLIC CAPITAL LETTER ABKHASIAN DZEU+04ECCYRILLIC CAPITAL LETTER E WITH DIAERESIS256 characters in the Cyrillic Unicode block, from number 231.
U+04E6CYRILLIC CAPITAL LETTER O WITH DIAERESISU+04E7CYRILLIC SMALL LETTER O WITH DIAERESISU+04E8CYRILLIC CAPITAL LETTER BARRED OU+04E9CYRILLIC SMALL LETTER BARRED OU+04EACYRILLIC CAPITAL LETTER BARRED O WITH DIAERESISU+04EBCYRILLIC SMALL LETTER BARRED O WITH DIAERESISU+04ECCYRILLIC CAPITAL LETTER E WITH DIAERESISU+04EDCYRILLIC SMALL LETTER E WITH DIAERESISU+04EECYRILLIC CAPITAL LETTER U WITH MACRONU+04EFCYRILLIC SMALL LETTER U WITH MACRONU+04F0CYRILLIC CAPITAL LETTER U WITH DIAERESISU+04F1CYRILLIC SMALL LETTER U WITH DIAERESISU+04F2CYRILLIC CAPITAL LETTER U WITH DOUBLE ACUTEU+04F3CYRILLIC SMALL LETTER U WITH DOUBLE ACUTEU+04F4CYRILLIC CAPITAL LETTER CHE WITH DIAERESISU+04F5CYRILLIC SMALL LETTER CHE WITH DIAERESISU+04F6CYRILLIC CAPITAL LETTER GHE WITH DESCENDERU+04F7CYRILLIC SMALL LETTER GHE WITH DESCENDERU+04F8CYRILLIC CAPITAL LETTER YERU WITH DIAERESISU+04F9CYRILLIC SMALL LETTER YERU WITH DIAERESISU+04FACYRILLIC CAPITAL LETTER GHE WITH STROKE AND HOOKU+04FBCYRILLIC SMALL LETTER GHE WITH STROKE AND HOOKU+04FCCYRILLIC CAPITAL LETTER HA WITH HOOKU+04FDCYRILLIC SMALL LETTER HA WITH HOOKU+04FECYRILLIC CAPITAL LETTER HA WITH STROKEU+04FFCYRILLIC SMALL LETTER HA WITH STROKE