This property defines the Unicodes which belongs to Runic block
Characters like ᚠ,ᚡ,ᚢ, etc. are listed under Runic Block.
90 Characters are present in Runic Block starting with the Unicode point U+16A0 that represents the character ᚠ.
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.