This property defines the Diacritic Unicodes which can be present at Bottom of the base character
Characters like ़,ु,ू, etc. are listed under Bottom Indic Positional Category.
356 Characters are present in Bottom Indic Positional Category starting with the Unicode point U+093C that represents the character ़.
Currently, as per latest version 15.0.0, Unicode supports 15 number of Indic Positional Category. Here are a few examples - Bottom,Bottom And Left,Bottom And Right, etc.