This property defines the Unicodes which belongs to Optical Character Recognition block
Characters like ⑀,⑁,⑂, etc. are listed under Optical Character Recognition Block.
12 Characters are present in Optical Character Recognition Block starting with the Unicode point U+2440 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.