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The Hebrew word chai is made up of the Hebrew letters chet and yud. All of those letters have a number value of 18.Jews often give gifts and donations in multiples of 18, which is called "giving chai". Mailings from Jewish charities usually suggest the amounts to give in multiples of chai rather than the usual multiples of 25. The word chai means ‘life’ which is highly valued in Judaism.Many Jews wear necklaces with the word Chai on them. Also chai is the slogan for Jewish people.