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

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