This property defines the Unicodes which belongs to CJK Unified Ideographs Extension C block
Characters like 𪜀,𪜁,𪜂, etc. are listed under CJK Unified Ideographs Extension C Block.
4155 Characters are present in CJK Unified Ideographs Extension C Block starting with the Unicode point U+2A700 that represents the character 𪜀.
Currently, as per latest version 15.0.0, Unicode supports 328 number of Block. Here are a few examples - Latin Extended E,Adlam,Aegean Numbers, etc.