16 characters in the Kanbun Unicode block.
U+3190IDEOGRAPHIC ANNOTATION LINKING MARKU+3191IDEOGRAPHIC ANNOTATION REVERSE MARKU+3192IDEOGRAPHIC ANNOTATION ONE MARKU+3193IDEOGRAPHIC ANNOTATION TWO MARKU+3194IDEOGRAPHIC ANNOTATION THREE MARKU+3195IDEOGRAPHIC ANNOTATION FOUR MARKU+3196IDEOGRAPHIC ANNOTATION TOP MARKU+3197IDEOGRAPHIC ANNOTATION MIDDLE MARKU+3198IDEOGRAPHIC ANNOTATION BOTTOM MARKU+3199IDEOGRAPHIC ANNOTATION FIRST MARKU+319AIDEOGRAPHIC ANNOTATION SECOND MARKU+319BIDEOGRAPHIC ANNOTATION THIRD MARKU+319CIDEOGRAPHIC ANNOTATION FOURTH MARKU+319DIDEOGRAPHIC ANNOTATION HEAVEN MARKU+319EIDEOGRAPHIC ANNOTATION EARTH MARKU+319FIDEOGRAPHIC ANNOTATION MAN MARK