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  2. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    The Roman numerals, in particular, are directly derived from the Etruscan number symbols: 𐌠 , 𐌡 , 𐌢 , 𐌣 , and 𐌟 for 1, 5, 10, 50, and 100 (they had more symbols for larger numbers, but it is unknown which symbol represents which number). As in the basic Roman system, the Etruscans wrote the symbols that added to the desired ...

  3. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    They are used only when dialing a telephone number in a country or world region other than the caller's. Country codes are dialed before the national telephone number, but require at least one additional prefix, the international call prefix which is an exit code from the national numbering plan to the international one.

  4. Palindromic number - Wikipedia

    en.wikipedia.org/wiki/Palindromic_number

    Palindromic number. A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16461) that remains the same when its digits are reversed. In other words, it has reflectional symmetry across a vertical axis. The term palindromic is derived from palindrome, which refers to a word (such as rotor or ...

  5. July 4th isn’t really Independence Day. And we Americans get ...

    www.aol.com/july-4th-isn-t-really-110200680.html

    It ought to be commemorated as the day of deliverance by solemn acts of devotion to God Almighty; it ought to be solemnized with pomp and parade, with shows, games, sports, guns, bells, bonfires ...

  6. This 12-year-old memorized the periodic table at age 2. He’s ...

    www.aol.com/12-old-memorized-periodic-table...

    Recent high school graduate Suborno Isaac Bari, 12, plans to start studying math and physics at New York University in the fall, but he’s already got his ambitious sights set on beginning a ...

  7. 4 - Wikipedia

    en.wikipedia.org/wiki/4

    Four is the smallest non-unitary tetrahedral number. [6] Each natural number divisible by 4 is a difference of squares of two natural numbers, i.e. . A number is a multiple of 4 if its last two digits are a multiple of 4 (for example, 1092 is a multiple of 4 because 92 = 4 × 23 ).

  8. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Belgian telephone numbers consist of three parts: First '0', secondly the "zone prefix" ( A) which has one or two digits for landlines and three digits for mobile phones, and thirdly the "subscriber's number" ( B ). Land lines always have nine digits. They are prefixed by a zero, followed by the zone prefix.

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