I was reading about CMB Polarization here. I know that $E$ and $B$ stand for E-mode and B-mode, but what does the $T$ mean? The author states that there are 3 observables: $T, E, B$ and six spectra: $TT$, $EE$, $BB$, $TE$, $TB$, $EB$ two of which ($TB$, $EB$) are zero because of parity (I don't understand this part). Can someone help me clarity this also?
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