This property defines the Diacritic Unicodes which can be present at Bottom And Right of the base character
Characters like ᬻ,ꦾ,꧀, etc. are listed under Bottom And Right Indic Positional Category.
4 Characters are present in Bottom And Right Indic Positional Category starting with the Unicode point U+1B3B 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.