  We investigate the hadron production from the vortical quark-gluon plasma
created in heavy-ion collisions. Based on the quark-coalescence and statistical
hadronization models, we show that total hadron yields summed over the spin
components are enhanced by the local vorticity with quadratic dependence. The
enhancement factor amounts to be a few percent and may be detectable within
current experimental sensitivities. We also show that the effect is stronger
for hadrons with larger spin, and thus propose a new signature of the local
vorticity, which may be detected by the yield ratio of distinct hadron species
having different spins such as $\phi$ and $\eta'$. The vorticity dependence of
hadron yields seems robust, with consistent predictions in both of the hadron
production mechanisms for reasonable values of the vorticity strength estimated
for heavy-ion collisions.
