Lattices and Z-modules in Euclidean space possess an infinitude of subsets
that are images of the original set under similarity transformation. We cla
ssify such self-similar images according to their indices for certain 4D ex
amples that are related to 4D root systems, both crystallographic and nan-c
rystallographic. We encapsulate their statistics in terms of Dirichlet seri
es generating functions and derive same of their asymptotic properties.