This property defines the Decomposition Type of the Unicodes as Subscript Form
Characters like ᵢ,ᵣ,ᵤ, etc. are listed under Subscript Form Decomposition Type.
64 Characters are present in Subscript Form Decomposition Type starting with the Unicode point U+1D62 that represents the character ᵢ.
Currently, as per latest version 15.0.0, Unicode supports 18 number of Decomposition Type. Here are a few examples - Canonical Decomposition,Compatibility,Enclosing Mark, etc.