Tav (or Taw, or Taf) is the twenty second and final letter of the Hebrew Alphabet. It signifies 400. Tav is the last letter of emet, Hebrew for “truth.” The other letters of the word, Aleph, and Memis are the first and middle letter. Thus, truth is all encompassing, “from aleph to tav” or “from beginning to end.”
As the symbol of truth, perfection, and completion, it is a mark, a sign, an omen, or a seal. It represents Tikkun Olam, the restoration of all things or repair of the world on a grand level. More personally, it is teshuvah; a return to the essence and purpose of one’s life.
In Christ Tav represents completion, growth in Grace.
We must reach the end of the old before beginning again, or being born again, with the Oneness of Aleph, this is the cycle of teshuvah. Tav is the final letter of Beresheet, “In the Beginning”, the first word of the Torah. This shows us that God had the end planned from the beginning.
The Creation set in motion all of existence that all may reach their final state of perfection, their true selves. This is after all the plan, to reach the fulfillment of creation. Without the beginning, Aleph, we have met, Hebrew for “dead.”