Numerological Associations
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 (see "Lamedvavniks" etc.). For this reason, 18 is a spiritual number in Judaism, and many Jews give gifts of money in multiples of 18 as a result.
Read more about this topic: Chai (symbol)
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“There is ... no glamor at banquets—I mean the large formal banquets of big associations and societies. There is only a kind of dignified confusion that gradually unhinges the mind.”
—James Thurber (1894–1961)