This property defines the Unicodes which belongs to Sundanese block
Characters like ᮀ,ᮁ,ᮂ, etc. are listed under Sundanese Block.
64 Characters are present in Sundanese Block starting with the Unicode point U+1B80 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.