This property defines the Unicodes which belongs to Sinhala Archaic Numbers block
Characters like 𑇡,𑇢,𑇣, etc. are listed under Sinhala Archaic Numbers Block.
22 Characters are present in Sinhala Archaic Numbers Block starting with the Unicode point U+111E1 that represents the character 𑇡.
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.