Rademacher sign of a Boolean coloring

Given a Boolean coloring $\chi:\mathrm{Fin}\,m\to\{\mathrm{true},\mathrm{false}\}$ and a coordinate $j$, $\mathrm{RSign}(\chi,j)$ is the corresponding $\pm1$ Rademacher value: $+1$ if $\chi(j)=\mathrm{true}$, and $-1$ otherwise. This is the standard translation between a Boolean coloring and a $\{-1,+1\}$-valued sign vector used throughout discrepancy theory.