This property defines the Unicodes which belongs to Hangul Syllables block
Characters like 가,각,갂, etc. are listed under Hangul Syllables Block.
11173 Characters are present in Hangul Syllables Block starting with the Unicode point U+AC00 that represents the character 가.
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.