Block from U+2FF0 to U+2FFF. This block was introduced in Unicode version 3.0 (1999). It contains 12 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 not intended to provide a mechanism for the composition of complex characters, whether already encoded or not.