  We classify rank zero 5d SCFTs geometrically engineered from M-theory on
quasi-homogeneous compound Du Val isolated threefold singularities. For all
such theories, we characterize the Higgs Branch, by computing the dimension,
the continuous and discrete symmetry groups, as well as more refined details
such as the charges of the hypermultiplets under these groups. We derive these
data by means of a gauge-theoretic method, that we have recently introduced,
based on establishing a correspondence between an adjoint Higgs field and the
M-theory geometry. As a byproduct, this further allows us to construct several
T-brane backgrounds, that yield inequivalent 5d spectra but are associated with
the same geometry.
