Combining Diacritical Marks Extended characters supported by the Gentium Book Plus Italic font

Character	Image
COMBINING DOUBLED CIRCUMFLEX ACCENT (U+1AB0)
COMBINING DIAERESIS-RING (U+1AB1)
COMBINING INFINITY (U+1AB2)
COMBINING DOWNWARDS ARROW (U+1AB3)
COMBINING TRIPLE DOT (U+1AB4)
COMBINING X-X BELOW (U+1AB5)
COMBINING WIGGLY LINE BELOW (U+1AB6)
COMBINING OPEN MARK BELOW (U+1AB7)
COMBINING DOUBLE OPEN MARK BELOW (U+1AB8)
COMBINING LIGHT CENTRALIZATION STROKE BELOW (U+1AB9)
COMBINING STRONG CENTRALIZATION STROKE BELOW (U+1ABA)

Count: 11

Character
COMBINING PARENTHESES ABOVE (U+1ABB)
COMBINING DOUBLE PARENTHESES ABOVE (U+1ABC)
COMBINING PARENTHESES BELOW (U+1ABD)
COMBINING PARENTHESES OVERLAY (U+1ABE)
COMBINING LATIN SMALL LETTER W BELOW (U+1ABF)
COMBINING LATIN SMALL LETTER TURNED W BELOW (U+1AC0)
COMBINING LEFT PARENTHESIS ABOVE LEFT (U+1AC1)
COMBINING RIGHT PARENTHESIS ABOVE RIGHT (U+1AC2)
COMBINING LEFT PARENTHESIS BELOW LEFT (U+1AC3)
COMBINING RIGHT PARENTHESIS BELOW RIGHT (U+1AC4)
COMBINING SQUARE BRACKETS ABOVE (U+1AC5)
COMBINING NUMBER SIGN ABOVE (U+1AC6)
COMBINING INVERTED DOUBLE ARCH ABOVE (U+1AC7)
COMBINING PLUS SIGN ABOVE (U+1AC8)
COMBINING DOUBLE PLUS SIGN ABOVE (U+1AC9)
COMBINING DOUBLE PLUS SIGN BELOW (U+1ACA)
COMBINING TRIPLE ACUTE ACCENT (U+1ACB)
COMBINING LATIN SMALL LETTER INSULAR G (U+1ACC)
COMBINING LATIN SMALL LETTER INSULAR R (U+1ACD)
COMBINING LATIN SMALL LETTER INSULAR T (U+1ACE)

Count: 20