  The conversion of spin currents polarized in different directions into charge
currents is a keystone for novel spintronic devices. Van der Waals
heterostructures with tailored symmetry are a very appealing platform for such
a goal. Here, by performing nonlocal spin precession experiments, we
demonstrate the spin-to-charge conversion (SCC) of spins oriented in all three
directions (x, y, and z). By analyzing the magnitude and temperature dependence
of the signal in different configurations, we argue that the different SCC
components measured are likely due to spin-orbit proximity and broken symmetry
at the twisted graphene/NbSe$_2$ interface. Such efficient omnidirectional SCC
opens the door to the use of new architectures in spintronic devices, from
spin-orbit torques that can switch any magnetization to the magnetic state
readout of magnetic elements pointing in any direction.
