Ruddlesden-Popper nickelates have recently emerged as a promising platform for high-temperature superconductivity, where superconducting phases develop in close proximity to charge and spin density wave order. We utilized polarization-resolved Raman scattering to study these density wave (DW) and gain insight into their orbital character, gap amplitude and symmetry. We will present the phononic and electronic Raman responses of the trilayer nickelate La₄Ni₃O₁₀ across its concomitant charge and spin density wave transitions. In addition to distinct phonon anomalies occurring below the transition temperature, we observe a depletion of continuum spectral weight up to 114 meV and a pronounced peak centered at this energy. By combining momentum-selective information from polarized electronic Raman scattering with model calculations involving both Ni-3d_x²_−y² and Ni-3d_z² orbitals, we identify 114 meV as the energy scale 2Δ_DW of the DW gap, characterized by incoherent opening and non-mean-field behavior. Importantly, the model calculations reveal multiorbital origin of the corresponding 2Δ_DW peak.