TAV
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Tav, the final letter of the Hebrew alefbeit (alphabet). The picture behind tav is the sign or seal of a covenant. It was often used as a mark in the same sense as our signature is today, especially of those who could not read or write (similar to the practice of signing an "x" on a contract). Conceptually, tav is a wounding, as the sealing of a covenant required the wounding of the sacrifice, whose blood sealed the covenant.