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The second-order phase transition into a hidden order phase in URu$_2$Si$_2$goes along with an order parameter which is still a mystery, despite 30 yearsof research. However, it is understood that the symmetry of the order parametermust be related to the symmetry of the low lying local electronic $f$-states.Here we present results of a novel spectroscopy, namely core-level non-resonantinelastic x-ray scattering (NIXS). This method allows for the measurement oflocal high-multipole excitations and it is bulk sensitive. The observedanisotropy of the scattering function unambiguously shows that the 5$f$ groundstate wave function is composed mainly, but essentially not purely, of the$\Gamma_1$ with majority $J_z$ =$|4\rangle$ + $|-4\rangle$ and/or $\Gamma_2$singlet states.

Direct bulk sensitive probe of 5f symmetry in URu2Si2