Ideographic Description Characters

Block from U+2FF0 to U+2FFF. This block was introduced in Unicode version 3.0 (1999). It contains 16 codepoints.

The Wikipedia provides the following information on block Ideographic Description Characters:

Ideographic Description Characters is a Unicode block containing graphic characters used for describing CJK ideographs. They are used in Ideographic Description Sequences (IDS) to provide a description of an ideograph, in terms of what other ideographs make it up and how they are laid out relative to one another. An IDS provides the reader with a description of an ideograph that cannot be represented properly, usually because it is not encoded in Unicode; rendering systems are not intended to automatically compose the pieces into a complete ideograph, and the descriptions are not standardized.

Chart at Unicode.org (PDF)
Block at Decode Unicode

1. Ideographic Description Character Left To Right
2. Ideographic Description Character Above To Below
3. Ideographic Description Character Left To Middle and Right
4. Ideographic Description Character Above To Middle and Below
5. Ideographic Description Character Full Surround
6. Ideographic Description Character Surround From Above
7. Ideographic Description Character Surround From Below
8. Ideographic Description Character Surround From Left
9. Ideographic Description Character Surround From Upper Left
10. Ideographic Description Character Surround From Upper Right
11. Ideographic Description Character Surround From Lower Left
12. Ideographic Description Character Overlaid
13. Ideographic Description Character Surround From Right
14. Ideographic Description Character Surround From Lower Right
15. Ideographic Description Character Horizontal Reflection
16. Ideographic Description Character Rotation