The Hebrew letter ת Tav , spelled out in Hebrew תָו is the twenty-second , and last, letter in the Hebrew alphabet.
Each Hebrew letter has a numerical value, or gematria. The gematria of ת is 400, signifying perfection.
Each Hebrew letter also has a concept. ת signifies truth.
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How to write the letter ת Tav – Some of the letter writing videos are in Hebrew but they show the steps in writing each Hebrew letter and the sound they make when different vowel points, or niqqud, are used.