Kanbun
Block from U+3190 to U+319F. This block was introduced in Unicode version 1.1 (1993). It contains 16 codepoints.
The Wikipedia provides the following information on block Kanbun:
Kanbun is a Unicode block containing annotation characters used in Japanese copies (kanbun) of Classical Chinese texts, to indicate reading order.
Chart at Unicode.org (PDF)
Block at Decode Unicode
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Ideographic Annotation Linking MarkGlyph for U+3190 -
Ideographic Annotation Reverse MarkGlyph for U+3191 -
Ideographic Annotation One MarkGlyph for U+3192 -
Ideographic Annotation Two MarkGlyph for U+3193 -
Ideographic Annotation Three MarkGlyph for U+3194 -
Ideographic Annotation Four MarkGlyph for U+3195 -
Ideographic Annotation Top MarkGlyph for U+3196 -
Ideographic Annotation Middle MarkGlyph for U+3197 -
Ideographic Annotation Bottom MarkGlyph for U+3198 -
Ideographic Annotation First MarkGlyph for U+3199 -
Ideographic Annotation Second MarkGlyph for U+319A -
Ideographic Annotation Third MarkGlyph for U+319B -
Ideographic Annotation Fourth MarkGlyph for U+319C -
Ideographic Annotation Heaven MarkGlyph for U+319D -
Ideographic Annotation Earth MarkGlyph for U+319E -
Ideographic Annotation Man MarkGlyph for U+319F