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  2. 19 (number) - Wikipedia

    en.wikipedia.org/wiki/19_(number)

    19 is the first number in an infinite sequence of numbers in decimal whose digits start with 1 and have trailing 9's, that form triangular numbers containing trailing zeroes in proportion to 9s present in the original number; i.e. 19900 is the 199th triangular number, and 1999000 is the 1999th.

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    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

  4. Numerology - Wikipedia

    en.wikipedia.org/wiki/Numerology

    Numerology (known before the 20th century as arithmancy) is the belief in an occult, divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value, via an alphanumeric system, of the letters in words and names. When numerology is applied to a person's name, it is a form of onomancy.

  5. Alphabetic numeral system - Wikipedia

    en.wikipedia.org/wiki/Alphabetic_numeral_system

    Even though 1829 braille had a simple ciphered-positional system copied from Western numerals with a separate symbol for each digit, early experience with students forced its designer Louis Braille to simplify the system, bringing the number of available patterns (symbols) from 125 down to 63, so he had to repurpose a supplementary symbol to ...

  6. Chinese numerology - Wikipedia

    en.wikipedia.org/wiki/Chinese_numerology

    The number 1 (一, pinyin: yī; Cantonese Yale: yāt) is neither auspicious nor inauspicious. It is a number given to winners to indicate first place. But it can also symbolize loneliness or being single. For example: November 11 is the Singles' Day in China, as the date has four '1' which stand for singles.

  7. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    So too are the thousands, with the number of thousands followed by the word "thousand". The number one thousand may be written 1 000 or 1000 or 1,000; larger numbers are written for example 10 000 or 10,000 for ease of reading. European languages that use the comma as a decimal separator may correspondingly use the period as a thousands separator.

  8. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

  9. Number Forms - Wikipedia

    en.wikipedia.org/wiki/Number_Forms

    Number Forms is a Unicode block containing Unicode compatibility characters that have specific meaning as numbers, but are constructed from other characters. They consist primarily of vulgar fractions and Roman numerals .