The Taittiriya Upanishad is one of the older, "primary"
Upanishads commented upon by Shankara. It is a Mukhya Upanishad,
associated with the Taittiriya school of the Black Yajurveda. It
figures as number 7 in the Muktika canon of 108 Upanishads.
It is divided into three sections called Vallis. the Siksa Valli,
the Brahmananda Valli and the Bhrgu Valli. The Siksa Valli is
the first of the six Vedangas ("limbs" or auxiliaries of the
Vedas), concerned with phonetics and pronunciation. The other
two sections deal with the knowledge of Atman.
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