This property defines the Unicodes which belongs to Cyrillic Extended D block
Characters like 𞀰,𞀱,𞀲, etc. are listed under Cyrillic Extended D Block.
64 Characters are present in Cyrillic Extended D Block starting with the Unicode point U+1E030 that represents the character 𞀰.
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.