According to rashi the number of knots on a gematria: the word tzitzit has the value 600. Each tassel has eight threads (when doubled over) and five sets of knots, totalling 13. The sum of all numbers is 613, traditionally the number of mitzvot (commandments) in the TorahI have a Tallit that I got as a gift. The tallit is beautiful;, it has strings on the corners of the fabric. Can anyone help me understand the meaning of those strings?