7. Chai
Formed by the letters of the Hebrew alphabet Chet and Yod, Chai is a prominent feature of the Jewish culture. In the Hebrew language, the word chai spelled by these two letters means “living,” is related to the term for “life,” chaim, and also appears in the slogan “`am yisrael chai!“, “The people of Israel live!” .
Meaning:
Some people believe Chai refers to the Living God; others say it simply reflects Judaism’s focus on the importance of life. Whatever the reason, the concept of chai is important in Jewish culture. The typical Jewish toast is l’chayim (to life).
Significance:
The symbol of Chai is very significant for the Jewish popular culture as it is worn in the form of jewellery, medallions etc. Also, There have been various mystical numerological speculations about the fact that, according to the system of gematria, the letters of chai add up to 18. For this reason, 18 is a spiritual number in Judaism, and many Jews give charity in the multiples of 18 as a result.
Nes Gadol Haya Sham 