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  2. ISO 31-0 - Wikipedia

    en.wikipedia.org/wiki/ISO_31-0

    See Sect. 3.3 of the Standard text. Numbers should be printed in upright type. ISO 31-0 (after Amendment 2) specifies that "the decimal sign is either the comma on the line or the point on the line". This follows resolution 10 [1] of the 22nd CGPM, 2003. [2] For example, one divided by two (one half) may be written as 0.5 or 0,5.

  3. ISO 31-7 - Wikipedia

    en.wikipedia.org/wiki/ISO_31-7

    Quantity Unit Remarks Name Symbol Definition Name Symbol period, periodic time: T: time of one cycle: second: s: frequency: f, ν: f = 1/T: hertz: Hz: 1 Hz = 1 s −1: loudness level: L N: L N = ln(p eff /p 0) 1 kHz where p eff is the root-mean-square value of the sound pressure of a pure tone of 1 kHz, which is judged by a normal observer under standardized listening conditions as being as ...

  4. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    Any such symbol can be called a decimal mark, decimal marker, or decimal sign. Symbol-specific names are also used; decimal point and decimal comma refer to a dot (either baseline or middle ) and comma respectively, when it is used as a decimal separator; these are the usual terms used in English, [ 1 ] [ 2 ] [ 3 ] with the aforementioned ...

  5. Eastern Arabic numerals - Wikipedia

    en.wikipedia.org/wiki/Eastern_Arabic_numerals

    Negative signs are written to the right of magnitudes, e.g. −٣ (−3). In-line fractions are written with the numerator on the left and the denominator on the right of the fraction slash, e.g. ٢/٧ (2 ⁄ 7). The Arabic decimal separator ٫ (U+066B) or the comma , is used as the decimal mark, as in ٣٫١٤١٥٩٢٦٥٣٥٨ (3.14159265358).

  6. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    The Natural Area Code, this is the smallest base such that all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 6 ⁠ terminate, a number n is a regular number if and only if ⁠ 1 / n ⁠ terminates in base 30. 32: Duotrigesimal: Found in the Ngiti language. 33: Use of letters (except I, O, Q) with digits in vehicle registration plates of Hong Kong. 34

  7. ISO 31-1 - Wikipedia

    en.wikipedia.org/wiki/ISO_31-1

    Decimal subdivision of degrees is preferable (i.e., 12.5° instead of 12°30′) minute ′ 1′ = (1 ⁄ 60)° second ″ 1″ = (1 ⁄ 60)′ solid angle: Ω: steradian: sr: 1 sr = 1 m 2 ⁄ m 2 = 1: length: l, L metre: m The metre is the length of the path travelled by light in vacuum during a time interval of 1 ⁄ 299 792 458 of a second ...

  8. ISO/IEC 80000 - Wikipedia

    en.wikipedia.org/wiki/ISO/IEC_80000

    ISO 80000-1:2022 revised ISO 80000-1:2009, which replaced ISO 31-0:1992 and ISO 1000:1992. [22] This document gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities (ISQ). [ 3 ]

  9. Mathematical Alphanumeric Symbols - Wikipedia

    en.wikipedia.org/wiki/Mathematical_Alphanumeric...

    Mathematical Alphanumeric Symbols is a Unicode block comprising styled forms of Latin and Greek letters and decimal digits that enable mathematicians to denote different notions with different letter styles. The letters in various fonts often have specific, fixed meanings in particular areas of mathematics.