Small combining parentheses above a letter, meant to enclose another accent on top, marking it optional or uncertain.
U+1ABACOMBINING STRONG CENTRALIZATION STROKE BELOWU+1ABCCOMBINING DOUBLE PARENTHESES ABOVEU+1AB9COMBINING LIGHT CENTRALIZATION STROKE BELOWU+1ABDCOMBINING PARENTHESES BELOWU+1AB8COMBINING DOUBLE OPEN MARK BELOWU+1ABECOMBINING PARENTHESES OVERLAYU+1AB7COMBINING OPEN MARK BELOWU+1ABFCOMBINING LATIN SMALL LETTER W BELOWU+1AB6COMBINING WIGGLY LINE BELOWU+1AC0COMBINING LATIN SMALL LETTER TURNED W BELOWU+1AB5COMBINING X-X BELOWU+1AC1COMBINING LEFT PARENTHESIS ABOVE LEFT65 characters in the Combining Diacritical Marks Extended Unicode block.
U+1AB0COMBINING DOUBLED CIRCUMFLEX ACCENTU+1AB1COMBINING DIAERESIS-RINGU+1AB2COMBINING INFINITYU+1AB3COMBINING DOWNWARDS ARROWU+1AB4COMBINING TRIPLE DOTU+1AB5COMBINING X-X BELOWU+1AB6COMBINING WIGGLY LINE BELOWU+1AB7COMBINING OPEN MARK BELOWU+1AB8COMBINING DOUBLE OPEN MARK BELOWU+1AB9COMBINING LIGHT CENTRALIZATION STROKE BELOWU+1ABACOMBINING STRONG CENTRALIZATION STROKE BELOWU+1ABBCOMBINING PARENTHESES ABOVEU+1ABCCOMBINING DOUBLE PARENTHESES ABOVEU+1ABDCOMBINING PARENTHESES BELOWU+1ABECOMBINING PARENTHESES OVERLAYU+1ABFCOMBINING LATIN SMALL LETTER W BELOWU+1AC0COMBINING LATIN SMALL LETTER TURNED W BELOWU+1AC1COMBINING LEFT PARENTHESIS ABOVE LEFTU+1AC2COMBINING RIGHT PARENTHESIS ABOVE RIGHTU+1AC3COMBINING LEFT PARENTHESIS BELOW LEFTU+1AC4COMBINING RIGHT PARENTHESIS BELOW RIGHTU+1AC5COMBINING SQUARE BRACKETS ABOVEU+1AC6COMBINING NUMBER SIGN ABOVEU+1AC7COMBINING INVERTED DOUBLE ARCH ABOVEU+1AC8COMBINING PLUS SIGN ABOVEU+1AC9COMBINING DOUBLE PLUS SIGN ABOVEU+1ACACOMBINING DOUBLE PLUS SIGN BELOWU+1ACBCOMBINING TRIPLE ACUTE ACCENTU+1ACCCOMBINING LATIN SMALL LETTER INSULAR GU+1ACDCOMBINING LATIN SMALL LETTER INSULAR RU+1ACECOMBINING LATIN SMALL LETTER INSULAR TU+1ACFCOMBINING DOUBLE CARONU+1AD0COMBINING VERTICAL-LINE-ACUTEU+1AD1COMBINING GRAVE-VERTICAL-LINEU+1AD2COMBINING VERTICAL-LINE-GRAVEU+1AD3COMBINING ACUTE-VERTICAL-LINEU+1AD4COMBINING VERTICAL-LINE-MACRONU+1AD5COMBINING MACRON-VERTICAL-LINEU+1AD6COMBINING VERTICAL-LINE-ACUTE-GRAVEU+1AD7COMBINING VERTICAL-LINE-GRAVE-ACUTEU+1AD8COMBINING MACRON-ACUTE-GRAVEU+1AD9COMBINING SHARP SIGNU+1ADACOMBINING FLAT SIGNU+1ADBCOMBINING DOWN TACK ABOVEU+1ADCCOMBINING DIAERESIS WITH RAISED LEFT DOTU+1ADDCOMBINING DOT-AND-RING BELOWU+1ADECOMBINING GRAVE-DOTU+1ADFCOMBINING DOT-ACUTEU+1AE0COMBINING LEFT TACK ABOVEU+1AE1COMBINING RIGHT TACK ABOVEU+1AE2COMBINING MINUS SIGN ABOVEU+1AE3COMBINING INVERTED BRIDGE ABOVEU+1AE4COMBINING SQUARE ABOVEU+1AE5COMBINING SEAGULL ABOVEU+1AE6COMBINING DOUBLE ARCH BELOWU+1AE7COMBINING DOUBLE ARCH ABOVEU+1AE8COMBINING EQUALS SIGN ABOVEU+1AE9COMBINING LEFT ANGLE CENTRED ABOVEU+1AEACOMBINING UPWARDS ARROW ABOVEU+1AEBCOMBINING DOUBLE RIGHTWARDS ARROW ABOVEU+1AECCOMBINING CARON-ACUTEU+1AEDCOMBINING VERTICAL-LINE-DOUBLE-ACUTEU+1AEECOMBINING DOUBLE GRAVE ACCENT BELOWU+1AEFCOMBINING DOUBLE ACUTE ACCENT BELOWU+1AF0COMBINING DOUBLE COMMA ABOVE