This property defines the Unicodes which belongs to Geometric Shapes block
Characters like ■,□,▢, etc. are listed under Geometric Shapes Block.
96 Characters are present in Geometric Shapes Block starting with the Unicode point U+25A0 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.