This property defines the Unicodes which belongs to CJK Unified Ideographs Extension G block
Characters like 𰀀,𰀁,𰀂, etc. are listed under CJK Unified Ideographs Extension G Block.
4940 Characters are present in CJK Unified Ideographs Extension G Block starting with the Unicode point U+30000 that represents the character 𰀀.
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.