Tav (ת) is the final letter, meaning a "sign" or "covenant." In ancient times, it was written as a cross, symbolizing the completion of a cycle and the seal of truth. It represents totality, cosmic truth, and the ultimate purpose of creation. Tav is the final synthesis of all the letters, the end that contains the beginning (Aleph). In esoteric knowledge, Tav teaches that all of reality is a divine signature, and our spiritual journey is about recognizing this ultimate truth and aligning with it completely.