Capital O with a horn and a dot underneath, used in Vietnamese for the heavy (nặng) tone.
U+1EE1LATIN SMALL LETTER O WITH HORN AND TILDEU+1EE3LATIN SMALL LETTER O WITH HORN AND DOT BELOWU+1EE0LATIN CAPITAL LETTER O WITH HORN AND TILDEU+1EE4LATIN CAPITAL LETTER U WITH DOT BELOWU+1EDFLATIN SMALL LETTER O WITH HORN AND HOOK ABOVEU+1EE5LATIN SMALL LETTER U WITH DOT BELOWU+1EDELATIN CAPITAL LETTER O WITH HORN AND HOOK ABOVEU+1EE6LATIN CAPITAL LETTER U WITH HOOK ABOVEU+1EDDLATIN SMALL LETTER O WITH HORN AND GRAVEU+1EE7LATIN SMALL LETTER U WITH HOOK ABOVEU+1EDCLATIN CAPITAL LETTER O WITH HORN AND GRAVEU+1EE8LATIN CAPITAL LETTER U WITH HORN AND ACUTE256 characters in the Latin Extended Additional Unicode block, from number 227.
U+1EE2LATIN CAPITAL LETTER O WITH HORN AND DOT BELOWU+1EE3LATIN SMALL LETTER O WITH HORN AND DOT BELOWU+1EE4LATIN CAPITAL LETTER U WITH DOT BELOWU+1EE5LATIN SMALL LETTER U WITH DOT BELOWU+1EE6LATIN CAPITAL LETTER U WITH HOOK ABOVEU+1EE7LATIN SMALL LETTER U WITH HOOK ABOVEU+1EE8LATIN CAPITAL LETTER U WITH HORN AND ACUTEU+1EE9LATIN SMALL LETTER U WITH HORN AND ACUTEU+1EEALATIN CAPITAL LETTER U WITH HORN AND GRAVEU+1EEBLATIN SMALL LETTER U WITH HORN AND GRAVEU+1EECLATIN CAPITAL LETTER U WITH HORN AND HOOK ABOVEU+1EEDLATIN SMALL LETTER U WITH HORN AND HOOK ABOVEU+1EEELATIN CAPITAL LETTER U WITH HORN AND TILDEU+1EEFLATIN SMALL LETTER U WITH HORN AND TILDEU+1EF0LATIN CAPITAL LETTER U WITH HORN AND DOT BELOWU+1EF1LATIN SMALL LETTER U WITH HORN AND DOT BELOWU+1EF2LATIN CAPITAL LETTER Y WITH GRAVEU+1EF3LATIN SMALL LETTER Y WITH GRAVEU+1EF4LATIN CAPITAL LETTER Y WITH DOT BELOWU+1EF5LATIN SMALL LETTER Y WITH DOT BELOWU+1EF6LATIN CAPITAL LETTER Y WITH HOOK ABOVEU+1EF7LATIN SMALL LETTER Y WITH HOOK ABOVEU+1EF8LATIN CAPITAL LETTER Y WITH TILDEU+1EF9LATIN SMALL LETTER Y WITH TILDEU+1EFALATIN CAPITAL LETTER MIDDLE-WELSH LLU+1EFBLATIN SMALL LETTER MIDDLE-WELSH LLU+1EFCLATIN CAPITAL LETTER MIDDLE-WELSH VU+1EFDLATIN SMALL LETTER MIDDLE-WELSH VU+1EFELATIN CAPITAL LETTER Y WITH LOOPU+1EFFLATIN SMALL LETTER Y WITH LOOP