This property defines the Unicodes which belongs to Mongolian Supplement block
Characters like 𑙠,𑙡,𑙢, etc. are listed under Mongolian Supplement Block.
14 Characters are present in Mongolian Supplement Block starting with the Unicode point U+11660 that represents the character 𑙠.
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.