This property defines the Unicodes which belongs to Mongolian block
Characters like ᠀,᠁,᠂, etc. are listed under Mongolian Block.
161 Characters are present in Mongolian Block starting with the Unicode point U+1800 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.