This property defines the Unicodes which belongs to Unified Canadian Aboriginal Syllabics block
Characters like ᐀,ᐁ,ᐂ, etc. are listed under Unified Canadian Aboriginal Syllabics Block.
640 Characters are present in Unified Canadian Aboriginal Syllabics Block starting with the Unicode point U+1400 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.