This property defines the Unicodes which belongs to Nushu block
Characters like 𛅰,𛅱,𛅲, etc. are listed under Nushu Block.
397 Characters are present in Nushu Block starting with the Unicode point U+1B170 that represents the character 𛅰.
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.