  We calculate the large scale polarization of the cosmic microwave background
induced by the anisotropy of the spatial geometry of our universe. Assuming an
eccentricity at decoupling of about $0.64 10^{-2}$, we find $\Delta T_{pol}/
T_0 \simeq 0.53 10^{-6}$ quite close to the average level of polarization
detected by the Wilkinson Microwave Anisotropy Probe.
