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  • Thumbnail for NACA airfoil
    aircraft. The NACA four-digit wing sections define the profile by: First digit describing maximum camber as percentage of the chord. Second digit describing the...
    17 KB (2,607 words) - 05:22, 29 July 2024
  • Postal codes in Singapore have consisted of six digits since 1995, replacing the four-digit system introduced in 1979. They are administered by Singapore...
    6 KB (563 words) - 11:33, 19 February 2024
  • Thumbnail for Benford's law
    anomalous numbers, or the first-digit law, is an observation that in many real-life sets of numerical data, the leading digit is likely to be small. In sets...
    65 KB (7,358 words) - 15:48, 5 September 2024
  • Thumbnail for Telephone numbers in the United Kingdom
    the local number part has more digits. Local customer numbers are four to eight digits long. The total number of digits is ten or, very rarely, nine. The...
    78 KB (5,977 words) - 15:39, 26 August 2024
  • 19 characters and has the form YYYYJJJJJVVVVMPPPPA where YYYY is the four-digit year of the reference and JJJJJ is a code indicating where the reference...
    6 KB (361 words) - 17:59, 26 March 2024
  • switched from its previous four-digit numbering system for passenger trains to a five-digit system on December 20, 2010. The first digit of the train number...
    16 KB (1,560 words) - 10:38, 12 September 2024
  • following rule: Take any four-digit number, using at least two different digits (leading zeros are allowed). Arrange the digits in descending and then in...
    4 KB (494 words) - 06:23, 21 April 2024
  • A check digit is a form of redundancy check used for error detection on identification numbers, such as bank account numbers, which are used in an application...
    18 KB (2,379 words) - 10:52, 27 July 2024
  • Thumbnail for Card security code
    cards is a three-digit number on the back of the card, to the right of the signature box. The CSC for American Express is a four-digit code on the front...
    15 KB (1,857 words) - 14:27, 29 August 2024
  • Thumbnail for Year 2000 problem
    and after the year 2000. Many programs represented four-digit years with only the final two digits, making the year 2000 indistinguishable from 1900....
    118 KB (12,792 words) - 06:38, 11 September 2024
  • Thumbnail for Napier's bones
    order to multiply 4-digit numbers – since numbers may have repeated digits, four copies of the multiplication table for each of the digits 0 to 9 are needed...
    35 KB (2,897 words) - 22:45, 14 April 2024
  • Thumbnail for Four-digit toad
    The four-digit toad or dwarf toad (Didynamipus sjostedti) is a species of toad in the family Bufonidae. It is found in Bioko (Equatorial Guinea), southwestern...
    5 KB (472 words) - 15:44, 3 July 2023
  • locality code, followed by four digits. Mobile numbers start with 77, then a mobile line locality code, followed by four digits. With the country code of...
    60 KB (9,001 words) - 22:15, 21 August 2024
  • constant, is a fixed point of this algorithm. Any four-digit number (in base 10) with at least two distinct digits will reach 6174 within seven iterations. The...
    9 KB (2,032 words) - 21:06, 31 August 2024
  • four digits, such as "Pennsylvania 5000". A rural telephone number, often party line, had often up to four digits and a letter or letter and digits to...
    13 KB (2,000 words) - 18:09, 11 February 2024
  • A merchant category code (MCC) is a four-digit number used for retail financial services to classify a business by the types of goods or services it provides...
    4 KB (416 words) - 03:20, 8 July 2024
  • Numbering Plan (NANP) of a three-digit area code, a three-digit central office code (or exchange code), and a four-digit station or line code. This is represented...
    8 KB (660 words) - 01:01, 25 August 2024
  • Thumbnail for Decimal separator
    four digits, corresponding to a nibble, or equivalently to a hexadecimal digit. For integer numbers, dots are used as well to separate groups of four...
    57 KB (5,476 words) - 23:12, 20 August 2024
  • Thumbnail for ZIP Code
    five digits. In 1983, an extended code was introduced named ZIP+4; it included the five digits of the ZIP Code, followed by a hyphen and four digits that...
    47 KB (5,668 words) - 03:50, 10 September 2024
  • is added to the number of days. The next four digits are the serial number. The last digit is the check digit. In Taiwan, an ID card is mandatory for all...
    122 KB (15,885 words) - 20:13, 8 September 2024
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