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There have been various mystical numerological reflections about the fact that, according to the system of gematria, the Hebrew letters of chai (חַי) add up to 18 [2] (see Lamedvavniks etc.). For this reason, 18 is a spiritually meaningful number in Judaism. Many Jews give gifts of money in multiples of 18 (see below). [2]
18 is a semiperfect number [1] and an abundant number. It is a largely composite number, [2] as it has 6 divisors and no smaller number has more than 6 divisors. There are 18 one-sided pentominoes. In the classification of finite simple groups, there are 18 infinite families of groups. [3]
The card depicts a night scene, where two large pillars are shown. A wolf and a domesticated dog howl at the Moon while a crayfish emerges from the water. The Moon has "sixteen chief and sixteen secondary rays" and "[is] shedding the moisture of fertilizing dew in great drops" (totaling 15 in the Rider–Waite deck) which are all Yodh-shaped.
3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.
Neo-Nazis also employ various number symbols: 18, code for Adolf Hitler. The number comes from the position of the letters in the alphabet: A = 1, H = 8. [12] 88, code for "Heil Hitler", a phrase used in the Nazi salute. [13] Also used as a reference to the "88 Precepts", a manifesto written by white supremacist David Lane.
The same suffix may be used with more than one category of number, as for example the orginary numbers secondary and tertiary and the distributive numbers binary and ternary. For the hundreds, there are competing forms: Those in -gent-, from the original Latin, and those in -cent-, derived from centi-, etc. plus the prefixes for 1 through 9 .
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A form of unary notation called Church encoding is used to represent numbers within lambda calculus. Some email spam filters tag messages with a number of asterisks in an e-mail header such as X-Spam-Bar or X-SPAM-LEVEL. The larger the number, the more likely the email is considered spam. 10: Bijective base-10: To avoid zero: 26: Bijective base-26