This property defines the Unicodes which belongs to Kana Supplement block
Characters like 𛀀,𛀁,𛀂, etc. are listed under Kana Supplement Block.
256 Characters are present in Kana Supplement Block starting with the Unicode point U+1B000 that represents the character 𛀀.
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.