This property defines the Unicodes which belongs to Old North Arabian block
Characters like 𐪀,𐪁,𐪂, etc. are listed under Old North Arabian Block.
32 Characters are present in Old North Arabian Block starting with the Unicode point U+10A80 that represents the character 𐪀.
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.