This property defines the Unicodes which have SignWriting script
Characters like 𝠀,𝠁,𝠂, etc. are listed under SignWriting Script.
672 Characters are present in SignWriting Script starting with the Unicode point U+1D800 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.