This property defines the Unicodes which are Number Joiner
Characters like 𑁿, etc. are listed under Number Joiner Indic Syllabic Category.
1 Characters are present in Number Joiner Indic Syllabic Category starting with the Unicode point U+1107F that represents the character 𑁿.
Currently, as per latest version 15.0.0, Unicode supports 36 number of Indic Syllabic Category. Here are a few examples - Avagraha,Bindu,Brahmi Joining Number, etc.