This property defines the Unicodes which belongs to Chess Symbols block
Characters like 🨀,🨁,🨂, etc. are listed under Chess Symbols Block.
100 Characters are present in Chess Symbols Block starting with the Unicode point U+1FA00 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.