This property defines the Unicodes which belongs to Miscellaneous Technical block
Characters like ⌀,⌁,⌂, etc. are listed under Miscellaneous Technical Block.
256 Characters are present in Miscellaneous Technical Block starting with the Unicode point U+2300 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.