This property defines the Unicodes which belongs to Miscellaneous Symbols block
Characters like ☀,☁,☂, etc. are listed under Miscellaneous Symbols Block.
256 Characters are present in Miscellaneous Symbols Block starting with the Unicode point U+2600 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.