  We propose a unified framework to classify gapped infra-red (IR) phases with
categorical symmetries, leading to a generalized, categorical Landau paradigm.
This is applicable in any dimension and gives a succinct, comprehensive, and
computationally powerful approach to classifying gapped symmetric phases. The
key tool is the symmetry topological field theory (SymTFT), which is a one
dimension higher TFT with two boundaries, which we choose both to be
topological. We illustrate the general idea for (1+1)d gapped phases with
categorical symmetries and suggest higher-dimensional extensions.
