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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. Genealogical numbering systems - Wikipedia

    en.wikipedia.org/wiki/Genealogical_numbering_systems

    The number of a person's father is twice their own number, and the number of a person's mother is twice their own, plus one. For instance, if John Smith is 10, his father is 20, and his mother is 21, and his daughter is 5. In order to readily have the generation stated for a certain person, the Ahnentafel numbering may be preceded by the ...

  4. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    In the Etruscan system, the symbol 1 was a single vertical mark, the symbol 10 was two perpendicularly crossed tally marks, and the symbol 100 was three crossed tally marks (similar in form to a modern asterisk *); while 5 (an inverted V shape) and 50 (an inverted V split by a single vertical mark) were perhaps derived from the lower halves of ...

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1] Some systems have two bases, a smaller (subbase) and a larger (base); an example is Roman numerals, which are organized by fives (V=5, L=50, D=500, the subbase) and tens (X ...

  6. Outline (list) - Wikipedia

    en.wikipedia.org/wiki/Outline_(list)

    A very different style recommended by The Chicago Manual of Style, [1] [11] based on the practice of the United States Congress in drafting legislation, suggests the following sequence, from the top to the seventh level (the only ones specified): I. A. 1. a) (1) (a) i) – capital Roman numerals with a period, capital letters with a period ...

  7. Timeline of numerals and arithmetic - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_numerals_and...

    12th century — Indian numerals have been modified by Persian mathematicians al-Khwārizmī to form the modern Arabic numerals (used universally in the modern world.) 12th century — the Arabic numerals reach Europe through the Arabs. 1202 — Leonardo Fibonacci demonstrates the utility of Hindu–Arabic numeral system in his Book of the Abacus.

  8. Alphabetic numeral system - Wikipedia

    en.wikipedia.org/wiki/Alphabetic_numeral_system

    An alphabetic numeral system employs the letters of a script in the specific order of the alphabet in order to express numerals. In Greek, letters are assigned to respective numbers in the following sets: 1 through 9, 10 through 90, 100 through 900, and so on. Decimal places are represented by a single symbol.

  9. Number Forms - Wikipedia

    en.wikipedia.org/wiki/Number_Forms

    They consist primarily of vulgar fractions and Roman numerals. In addition to the characters in the Number Forms block, three fractions (¼, ½, and ¾) were inherited from ISO-8859-1 , which was incorporated whole as the Latin-1 Supplement block.