This property defines the Unicodes which belongs to Tai Xuan Jing block
Characters like 𝌀,𝌁,𝌂, etc. are listed under Tai Xuan Jing Block.
88 Characters are present in Tai Xuan Jing Block starting with the Unicode point U+1D300 that represents the character 𝌀.
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.