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  2. ISBN - Wikipedia

    en.wikipedia.org/wiki/ISBN

    Moreover, the 10-digit ISBN check digit generally is not the same as the 13-digit ISBN check digit. Because the GTIN-13 is part of the Global Trade Item Number (GTIN) system (that includes the GTIN-14, the GTIN-12, and the GTIN-8), the 13-digit ISBN falls within the 14-digit data field range.

  3. Numerical digit - Wikipedia

    en.wikipedia.org/wiki/Numerical_digit

    A numerical digit (often shortened to just digit) or numeral is a single symbol used alone (such as "1") or in combinations (such as "15"), to represent numbers in a positional numeral system. The name "digit" comes from the fact that the ten digits ( Latin digiti meaning fingers) [1] of the hands correspond to the ten symbols of the common ...

  4. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base. In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  5. North American Numbering Plan expansion - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering...

    Since currently the 4th digit (or digit 'D') cannot be 1 or 0, if the telephone system detects 1 or 0 in the 4th position it will process the number as a new 12-digit number, and if it is any digit other than 1 or 0, it can process it as an existing 10-digit number until the transition is complete. Other proposals

  6. Aadhaar - Wikipedia

    en.wikipedia.org/wiki/Aadhaar

    Aadhaar ( Hindi: आधार, lit. 'base, foundation'; sometimes informally called UIDAI ID or UIDAI Number) [7] is a 12-digit unique identity number that can be obtained voluntarily by all residents of India, based on their biometrics (10 finger prints, 2 iris prints and photo of face) and demographic data. [8] The data is collected by the ...

  7. International Article Number - Wikipedia

    en.wikipedia.org/wiki/International_Article_Number

    The most commonly used EAN standard is the thirteen-digit EAN-13, a superset of the original 12-digit Universal Product Code (UPC-A) standard developed in 1970 by George J. Laurer. An EAN-13 number includes a 3-digit GS1 prefix (indicating country of registration or special type of product). A prefix with a first digit of "0" indicates a 12 ...

  8. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π ( / paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.

  9. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    Mathematics – Bases: 9,439,829,801,208,141,318 (≈9.44 × 10 18) is the 10th and (by conjecture) largest number with more than one digit that can be written from base 2 to base 18 using only the digits 0 to 9, meaning the digits for 10 to 17 are not needed in bases above 10.