This property defines the Unicodes which have Mongolian script
Characters like ᠀,᠁,᠄, etc. are listed under Mongolian Script.
168 Characters are present in Mongolian Script starting with the Unicode point U+1800 that represents the character ᠀.
Currently, as per latest version 15.0.0, Unicode supports 164 number of Script. Here are a few examples - Adlam,Ahom,Anatolian Hieroglyphs, etc.