The numbers 22, 18 and 108 all have alleged sacred meaning. The numbers' meanings come from a variety of religions and traditions in both the East and the West.
The number 22 carries significant meaning in Christianity, since the first epistle to the last is 22 books. There are also 22 letters in the Hebrew alphabet. Revelation ends the Bible on the 22nd chapter, and Jesus quotes the opening of Psalm 22 while on the cross.
The Hebrew word "Chai" translates to "life" in English, and it figures prominently in modern Jewish culture. The word is spelled using the Hebrew letters "Chet" and "Yod," which together equal the number 18 using the gematria system that assigns numerical values to certain letters. In turn, the number 18 is used to represent life, and it is custom in modern Jewish tradition to give donations in multiples of 18.
The number 108 is considered sacred in many eastern religions, such as Hinduism and Buddhism. Hindus are known to recite Shiva's 108 names during their morning prayers, and Buddhist rosaries use 108 beads since the words of the Buddha are written in 108 volumes. Some schools of Buddhism also believe that there are 108 feelings, a number reached by multiplying the value of other senses.