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What is the origin of the word “Hebrew” and what does it mean?

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When we visited my grandmother recently I noticed she had a small colorful box at the entrance for putting coins into for charity. Does this box have a name? Is it a common thing to have? Thanks.

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I would like to know how to define the root word ענה, what actual meanings are given to this root and what is the common denomitor? [I’ve found this root in different verses, so I don’t want to focus on just one verse. But to name some I came across this root in Bereshit 18:27, Shemot 10:3, Shemot 22:22, Vayikra 23:27, Yeshayahu 58:3, I even came across a phrase outside of the Tenach in which it could mean ‘apologize’ (נעניתי לך מחול לי)]

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1. What does Posek Hador mean? 2. What does Maran mean? 3. What does shlita mean? 4. What does Segula mean? 5. What does Zatzal mean? 5. What does Hagaon mean?

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Can you explain to me the origin and meaning of the Star of David? Who invented it and when? What does it symbolize? When did it come to be a symbol of Judaism? Thank you!