This property defines the Unicodes which belongs to Ancient Greek Numbers block
Characters like 𐅀,𐅁,𐅂, etc. are listed under Ancient Greek Numbers Block.
80 Characters are present in Ancient Greek Numbers Block starting with the Unicode point U+10140 that represents the character 𐅀.
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.