The Kanbun block specifies 16 characters.

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Kanbun Block

Ref.
Image		 Your
Browser
U+3190 ㆐ ㆐ ㆐ IDEOGRAPHIC ANNOTATION LINKING MARK
U+3191 ㆑ ㆑ ㆑ IDEOGRAPHIC ANNOTATION REVERSE MARK
U+3192 ㆒ ㆒ ㆒ IDEOGRAPHIC ANNOTATION ONE MARK
U+3193 ㆓ ㆓ ㆓ IDEOGRAPHIC ANNOTATION TWO MARK
U+3194 ㆔ ㆔ ㆔ IDEOGRAPHIC ANNOTATION THREE MARK
U+3195 ㆕ ㆕ ㆕ IDEOGRAPHIC ANNOTATION FOUR MARK
U+3196 ㆖ ㆖ ㆖ IDEOGRAPHIC ANNOTATION TOP MARK
U+3197 ㆗ ㆗ ㆗ IDEOGRAPHIC ANNOTATION MIDDLE MARK
U+3198 ㆘ ㆘ ㆘ IDEOGRAPHIC ANNOTATION BOTTOM MARK
U+3199 ㆙ ㆙ ㆙ IDEOGRAPHIC ANNOTATION FIRST MARK
U+319A ㆚ ㆚ ㆚ IDEOGRAPHIC ANNOTATION SECOND MARK
U+319B ㆛ ㆛ ㆛ IDEOGRAPHIC ANNOTATION THIRD MARK
U+319C ㆜ ㆜ ㆜ IDEOGRAPHIC ANNOTATION FOURTH MARK
U+319D ㆝ ㆝ ㆝ IDEOGRAPHIC ANNOTATION HEAVEN MARK
U+319E ㆞ ㆞ ㆞ IDEOGRAPHIC ANNOTATION EARTH MARK
U+319F ㆟ ㆟ ㆟ IDEOGRAPHIC ANNOTATION MAN MARK