  The local polarization of electromagnetic (EMW) and gravitational waves (GW)
is discussed from an operational point of view, in which all the relevant
mathematical framework is constructed in terms of measurements of the power
absorbed by a local detector. The intrinsic dependence of the observations upon
the nature of the detector is emphasized. In particular, the benefit of using a
dual-symmetric detector, equally sensitive to the electric and magnetic fields
of the EMW (resp. gravito-electric and gravito-magnetic tensor in the GW case)
is pointed out. The Majorana stellar representation of the polarization is
introduced, and its physical interpretation is highlighted. Finally,
expressions for the energy density, linear momentum density, helicity and spin
density of the wave in terms of the Majorana representation are presented.
