In many causal inference problems, multiple action variables share a common causal role yet lack a natural ordering. \revblue{We consider $K\geq2$ action variables, each evaluated under treatment or control conditions,} and formalize permutation equivariance, the principle that permuting the variables permutes the corresponding estimands in a trackable manner, hence preserving their scientific meaning. We characterize this principle algebraically and present a complete class of weighted permutation equivariant estimands capturing main effects and interactions of all orders. We discuss the interpretation and choice of weights and characterize residual-free estimands, whose inclusion--exclusion sum recovers the endpoint contrast between the all-treated and all-control configurations. \revblue{Applying our general framework to network interference yields a new hierarchy of direct, indirect, and overall effects, whose first-order aggregates recover the average effects of \citet{hu2022average}. We also identify the overall effects as mixed derivatives of expected welfare under independent Bernoulli assignment.} We illustrate the framework through the contexts of factorial studies, causal mediation, and network interference.

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