Mezuzah
The Mezuzah is the most prominent Jewish symbol, found at the doorstep of every Jewish home. ”. The Letter “ש" (Shin) found on every Mezuzah is the symbol of the name “Shadai”, the Name of God, which also the first letter of another Hebrew word: “Shomer” (the guard), symbolizing the Mezuzah's main function as a protection for the house and its inhabitants.