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We have investigated the antiferromagnetic insulating phase of theMott-Hubbard insulator V$_2$O$_3$ by resonant x-ray Bragg diffraction at thevanadium K-edge. Combining the information obtained from azimuthal angle scans,linear incoming polarization scans and by fitting collected data to thescattering amplitude derived from the established chemical I2/a and magneticspace groups we provide evidence of the ordering motif of anapolar moments(which results from parity violation coupling to an electromagnetic field).Experimental data (azimuthal dependence and polarization analysis) collected atspace-group forbidden Bragg reflections are successfully accounted within ourmodel in terms of vanadium magnetoelectric multipoles. We demonstrate thatresonant x-ray diffraction intensities in all space-group forbidden Braggreflections of the kind $(hkl)_m$ with odd $h$ are produced by an E1-E2 event.The determined tensorial parameters offer a test for ab-initio calculations inthis material, that can lead to a deeper and more quantitative understanding ofthe physical properties of V$_2$O$_3$.

Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction