URhSn exhibits successive phase transitions at $T_{\mathrm{O}}=54\mathrm{K}$ and $T_{\mathrm{C}}=16\mathrm{K}$. While the transition at $T_{\mathrm{C}}$ is known to be ferromagnetic, the nature of the intermediate phase between $T_{\mathrm{O}}$ and $T_{\mathrm{C}}$ has remained elusive. Here, we report ${}^{117}\mathrm{Sn}$ nuclear magnetic resonance (NMR) measurements on high-quality single crystals of URhSn, which reveal NMR line splittings indicative of symmetry breaking in the intermediate phase. The field-direction and site dependences of these splittings are consistent with antiferroquadrupolar ordering characterized by the space group $P321$ (No. 150). This finding confirms the emergence of a novel form of chiral order driven by electronic degrees of freedom, without an underlying chiral crystal structure in URhSn.

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• Chirality
• Multipole order
• Phase transitions
• Chiral symmetry
• Nuclear magnetic resonance