This property defines the Unicodes which belongs to Letterlike Symbols block
Characters like ℀,℁,ℂ, etc. are listed under Letterlike Symbols Block.
80 Characters are present in Letterlike Symbols Block starting with the Unicode point U+2100 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.