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  2. ISO 3166-2 - Wikipedia

    en.wikipedia.org/wiki/ISO_3166-2

    The following table can be used to access the current ISO 3166-2 codes of each country, and comprises three columns: [2] Entry: ISO 3166-1 alpha-2 code, click to view the ISO 3166-2 codes of the country; Country name: English short name officially used by the ISO 3166 Maintenance Agency (ISO 3166/MA)

  3. Airline codes - Wikipedia

    en.wikipedia.org/wiki/Airline_codes

    ICAO issued 3-letter-codes but kept the 2-letter-designators as official system ... The airline accounting code, or prefix code, is a 3-digit number, referenced by ...

  4. UN M49 - Wikipedia

    en.wikipedia.org/wiki/UN_M49

    Early editions of M.49 used one- or two-digit prefixes to designate economic regions rather than assigning 3-digit codes. These two digit prefixes were designed to be used to easily aggregate data through the use of prefix matching, and regions could be specified collectively by using the 000 code as a base to which the prefix would be added. [7]

  5. List of ISO 3166 country codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

    ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes. ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script ...

  6. Amazon Prime - Wikipedia

    en.wikipedia.org/wiki/Amazon_Prime

    In June 2018, Amazon launched Prime Australia, with a 2-business-day delivery promise, free delivery of international orders, and Amazon Video. [9] On March 3, 2020, Amazon announced it installed "mini-fulfillment centers" in select U.S. cities, including Dallas, Orlando, Philadelphia, and Phoenix to reduce same-day delivery times. [44]

  7. 3 - Wikipedia

    en.wikipedia.org/wiki/3

    When doing quick estimates, 3 is a rough approximation of π, 3.1415..., and a very rough approximation of e, 2.71828... 3 is the first Mersenne prime , as well as the second Mersenne prime exponent and the second double Mersenne prime exponent , for 7 and 127 , respectively. 3 is also the first of five known Fermat primes , which include 5, 17 ...