This property defines the Unicodes which belongs to CJK Compatibility Ideographs block
Characters like 豈,更,車, etc. are listed under CJK Compatibility Ideographs Block.
474 Characters are present in CJK Compatibility Ideographs Block starting with the Unicode point U+F900 that represents the character 豈.
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.