This property defines the Unicodes which belongs to Enclosed Ideographic Supplement block
Characters like 🈀,🈁,🈂, etc. are listed under Enclosed Ideographic Supplement Block.
69 Characters are present in Enclosed Ideographic Supplement Block starting with the Unicode point U+1F200 that represents the character 🈀.
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.