The Mezuzah is a symbol that can be seen on the right-hand doorpost in every Jewish household. It acknowledges God's sovereignty over the home. Having a mezuzah on your door, touching it and then touching your lips, will remind you to keep the word of God on your lips as you enter and leave your home.
It is customary for the mezuzah house to be adorned with the Hebrew word שדי (Shaddai), which is G-d’s most mystical name, or just the Hebrew letter ש (Shin) to represent the word Shaddai. This word is an abbreviation for “Shomer D’latot Yisrael” – the Guardian of Israel.