Taw, pronounced tav [ת], is the last letter of the Hebrew alphabet and the last letter in the Hebrew phrase translated “In the beginning”, with which the book of Genesis — and every Bible — commences. Scholars take this formulation to signify that with respect to the plans and purposes of God, the end of this world and its story was always determined from the very outset. We could argue that case persuasively from many scriptures, some including the phrase “from the foundation of the world”.
Taw’s meaning is “mark” or “seal”, and it signifies completion. With this last letter, our unknown psalmist concludes his effusive and unsurpassed paean to God’s law.