16 characters in the Ideographic Description Characters Unicode block.
U+2FF0IDEOGRAPHIC DESCRIPTION CHARACTER LEFT TO RIGHTU+2FF1IDEOGRAPHIC DESCRIPTION CHARACTER ABOVE TO BELOWU+2FF2IDEOGRAPHIC DESCRIPTION CHARACTER LEFT TO MIDDLE AND RIGHTU+2FF3IDEOGRAPHIC DESCRIPTION CHARACTER ABOVE TO MIDDLE AND BELOWU+2FF4IDEOGRAPHIC DESCRIPTION CHARACTER FULL SURROUNDU+2FF5IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM ABOVEU+2FF6IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM BELOWU+2FF7IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM LEFTU+2FF8IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM UPPER LEFTU+2FF9IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM UPPER RIGHTU+2FFAIDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM LOWER LEFTU+2FFBIDEOGRAPHIC DESCRIPTION CHARACTER OVERLAIDU+2FFCIDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM RIGHTU+2FFDIDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM LOWER RIGHTU+2FFEIDEOGRAPHIC DESCRIPTION CHARACTER HORIZONTAL REFLECTIONU+2FFFIDEOGRAPHIC DESCRIPTION CHARACTER ROTATION