This property defines the Unicodes which belongs to Old Italic block
Characters like 𐌀,𐌁,𐌂, etc. are listed under Old Italic Block.
40 Characters are present in Old Italic Block starting with the Unicode point U+10300 that represents the character 𐌀.
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.