Hai (חי) is a Hebrew word and symbol that means “life.” It is spelled with the Hebrew letters Het (ח) and Yud (י). Each letter in the Hebrew alphabet also has a numerical value. The Het has a value of 8 and the Yud has a value of 10. As a result, 18 is a popular number that represents good luck. This is why we are suggesting donations in multiples of 18, symbolically giving the gift of “life” or luck to the children at Mosaic.