  We classify the global one-form symmetries for non-Lagrangian $\mathcal{N}=3$
SCFTs that arise by the action of $S$-fold projections on D3-branes. Such a
classification is dictated, on a generic point of the Coulomb branch, by
probing the charge spectrum of $(p, q)$-strings in the brane setup. The charge
lattice of lines is then obtained by finding the ones that are genuine modulo
screening by dynamical particles. The one-form symmetries are then extracted
from the maximal sub-lattices of mutually local lines. We further comment on
the existence of non-invertible symmetries for some of these $\mathcal{N}=3$
SCFTs.

High Energy Physics - Theory