This property defines the Unicodes which belongs to Buhid block
Characters like ᝀ,ᝁ,ᝂ, etc. are listed under Buhid Block.
21 Characters are present in Buhid Block starting with the Unicode point U+1740 that represents the character ᝀ.
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.