This property defines the Unicodes which belongs to Javanese block
Characters like ꦀ,ꦁ,ꦂ, etc. are listed under Javanese Block.
93 Characters are present in Javanese Block starting with the Unicode point U+A980 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.