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  2. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    The Romans used a duodecimal rather than a decimal system for fractions, as the divisibility of twelve (12 = 2 2 × 3) makes it easier to handle the common fractions of 13 and 14 than does a system based on ten (10 = 2 × 5).

  3. Telephone numbers in Romania - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Romania

    Z=2 and 3 means a landline number; the YX code is 1 (with extra digit for local number) for Bucharest, from 30 to 69 for a county code, and 70 to 79 for non-geographic landline numbers; Z =7 (and possibly 6 in the future) means a mobile number; 070p-xxxxxx numbers are reserved for virtual operators, while 071p-xxxxxx to 079p-xxxxxx are reserved ...

  4. Romanian numbers - Wikipedia

    en.wikipedia.org/wiki/Romanian_numbers

    șaizeci does not follow the formation rule exactly. The expected form șasezeci does not exist. 3. This is a direct descendant of Latin vīgintī, which did not survive in Romanian. The other numbers between 20 and 99 are named by combining three words: the number of tens, the conjunction și "and", and the units. For example, 42 is patruzeci ...

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Using all numbers and all letters except I and O; the smallest base where ⁠ 1 / 2 ⁠ terminates and all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 18 ⁠ have periods of 4 or shorter. 35: Covers the ten decimal digits and all letters of the English alphabet, apart from not distinguishing 0 from O. 36: Hexatrigesimal [55] [56]

  6. Romanian alphabet - Wikipedia

    en.wikipedia.org/wiki/Romanian_alphabet

    The Romanian alphabet is a variant of the Latin alphabet used for writing the Romanian language. It is a modification of the classical Latin alphabet and consists of 31 letters, [1][2] five of which (Ă, Â, Î, Ș, and Ț) have been modified from their Latin originals for the phonetic requirements of the language. The letters Q (chiu), W ...

  7. Roman numeral analysis - Wikipedia

    en.wikipedia.org/wiki/Roman_numeral_analysis

    In music theory, Roman numeral analysis is a type of harmonic analysis in which chords are represented by Roman numerals, which encode the chord's degree and harmonic function within a given musical key. Specific notation conventions vary: some theorists use uppercase numerals (e.g. I, IV, V) to represent major chords, and lowercase numerals (e ...

  8. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent different numbers in different numeral systems. For example, "11" represents the number eleven in the decimal or ...

  9. History of ancient numeral systems - Wikipedia

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

    Numeral systems. Number systems have progressed from the use of fingers and tally marks, perhaps more than 40,000 years ago, to the use of sets of glyphs able to represent any conceivable number efficiently. The earliest known unambiguous notations for numbers emerged in Mesopotamia about 5000 or 6000 years ago.