This property defines the Unicodes which belongs to Enclosed CJK Letters and Months block
Characters like ㈀,㈁,㈂, etc. are listed under Enclosed CJK Letters and Months Block.
256 Characters are present in Enclosed CJK Letters and Months Block starting with the Unicode point U+3200 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.