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It is consistent with the measurement of \theta_13 ~ 0.15 by Daya Bay tosuppose that, in addition to being unitary, the neutrino mixing matrix is alsoalmost hermitian, and thereby only a small perturbation from diag(+1,-1,-1) ina suitable basis. We suggest this possibility simply as an easily falsifiableansatz that has not already been studied, as well as to offer a potentiallyuseful means of organizing the experimental data. We explore thephenomenological implications of this ansatz and parametrize one type ofdeviation from the leading order relation |V_e3| \approx |V_\tau 1|. We alsoemphasize the group-invariant angle between orthogonal matrices as a means ofcomparing to data. The discussion is purely phenomenological, without anyattempt to derive the condition V{\dag} \approx V from a fundamental theory.

The neutrino mixing matrix could (almost) be diagonal with entries {\pm}1