It is a small double clip, connected with a chain, that helps
hold the tallit on.
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Tallit is the Hebrew word for tallit. The English term is
"prayer shawl."
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In Jewish tradition, a boy does not wear a tallit intil he
becomes a bar mitzvah (turns 13) as wearing a tallit is an adult
obligation.
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it is important as it is a jewish tradition they are passed down from a farther to his son who then gives it to his son and so on because they pray with it