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The plural for mezuzah is mezuzot, and they're placed slanted on their doorposts.
Because the bathroom is not a place of dignified usage.
A Mezuzah case, is the protective and/or decorative case used to cover the Mezuzah Scroll. The Mezuzah scroll is a small parchment scroll that contains biblical passages, which is then place on the door post of homes according to Jewish Tradition. I'll attached a link of some cases so you can see what they look like.
Kiss the mezuzah. Some also say a verse from Psalms (Tehillim) when entering.
There are two parts of the Mezuzah, The Mezuzah Scroll itself and the Mezuzah Case. The Mezuzah Scroll is made with ink on parchment of a Kosher animal. The case can be made of almost any material as its purpose is to protect the scroll. Most common materials for the mezuzah case are metal, stone, wood and glass.
The mezuzah is not a reminder, but the fulfillment of a commandment or mitzvah - that found in Deuteronomy 6:9, which tell us to inscribe the words of the Sh'ma blessing upon the doorposts of our houses.
There is no limit to the size of a Mezuzah. Attached is a video of the largest known mezuzah recently installed at Ben Gurion Airport.
The significance of the mezuzah is all in the mezuzah scroll itself and therefore, when you hang a visible mezuzah scroll, there is no need for any symbolism. However, when you hang a mezuzah scroll in a protective case through which the scroll is not visible, it should have a letter "shin" (looks like this "\|/" ) on the front to indicate that there is mezuzah scroll inside and it is not just a nice case. The Shin is the first letter of the biblical paragraph written within the scroll as well as the name of g d Sha-dai. Having said that, there are many who choose to have various judaic symbols depicted on their mezuzah cases such as the Jewish star, hamsa, tree of life or other as shown in the attached link.
The Bible contains a commandment to "write these words on the doorposts of your homes, and on your gates." Many Jews keep this commandment by hanging the text of "these words" in the form of a little scroll in an ornamental case on the doorpost of their front door (and sometimes on interior doors). The scroll and case are usually called a mezuzah (the word just means doorpost). There's a brief blessing to say before hanging a mezuzah, and this blessing, plus the hanging of a mezuzah, frequently serves as the formal dedication of a new Jewish home.
For Jews, the Mezuzah is a symbol and reminder of our Jewish faith and what it stands for. By touching or kissing the mezuzah, one is acknowledging their love of G d and commitment to his commandments, as specified in the Mezuzah.
The scroll inside the mezuzah is written in Hebrew.
The origin of the mezuzah is from the "Shema" in which is mentioned the core beliefs of Judaism and its teachings. Therefore, the "purpose" of the mezuzah is as a reminder, when entering and leaving the home, of the mezuzah's message. The mezuzah contains a parchment inscribed with a passage from the Torah (from Deuteronomy ch.6 and ch.11), placed on Jewish doorposts.