This property defines the Unicodes which belongs to Siddham block
Characters like 𑖀,𑖁,𑖂, etc. are listed under Siddham Block.
94 Characters are present in Siddham Block starting with the Unicode point U+11580 that represents the character 𑖀.
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.