This property defines the Unicodes which have Javanese script
Characters like ꦀ,ꦁ,ꦂ, etc. are listed under Javanese Script.
90 Characters are present in Javanese Script starting with the Unicode point U+A980 that represents the character ꦀ.
Currently, as per latest version 15.0.0, Unicode supports 164 number of Script. Here are a few examples - Adlam,Ahom,Anatolian Hieroglyphs, etc.