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Question: What does the letter Shin on the outside of the Mezuza signify?
Answer: Great Question! The Shin represents the Hebrew Name for G-d, Sha-Dai, which means almighty-all powerful.
The full name Sha-dai is written in Hebrew on the outside of the scroll inside the case, while the case sometimes has a shin on the outside as well although it is not required.
Rabbi Zvi Holland
