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2-group symmetries arise when 1-form symmetries and 0-form symmetries of atheory mix with each other under group multiplication. We discover theexistence of 2-group symmetries in 5d N=1 abelian gauge theories arising on the(non-extended) Coulomb branch of 5d superconformal field theories (SCFTs),leading us to argue that the UV 5d SCFT itself admits a 2-group symmetry.Furthermore, our analysis determines the global forms of the 0-form flavorsymmetry groups of 5d SCFTs, irrespective of whether or not the 5d SCFT admitsa 1-form symmetry. As a concrete application of our method, we analyze 2-groupsymmetries of all 5d SCFTs, which reduce in the IR, after performing massdeformations, to 5d N=1 non-abelian gauge theories with simple, simplyconnected gauge groups. For rank-1 Seiberg theories, we check that ourpredictions for the flavor symmetry groups match with the superconformal andray indices available in the literature. We also comment on the mixed 't Hooftanomaly between 1-form and 0-form symmetries arising in 5d N=1 non-abeliangauge theories and its relation to the 2-groups.

The Global Form of Flavor Symmetries and 2-Group Symmetries in 5d SCFTs