2-Group symmetries and their classification in 6d

We uncover 2-group symmetries in 6d superconformal field theories. These arise when the discrete 1-form symmetry and continuous flavor group of a theory mix with each other. classify all theories such symmetries. The approach taken is applicable more generally, minor modifications to include dimension specific operators (such as instantons 5d monopoles 3d), we provide discussion dimension-independent aspects analysis. an ancillary mathematica code for computing symmetries, once input provided. also discuss mixed 't Hooft anomaly between 0-form