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  2. North American Industry Classification System - Wikipedia

    en.wikipedia.org/wiki/North_American_Industry...

    The North American Industry Classification System or NAICS ( / neɪks /) [1] is a classification of business establishments by type of economic activity (the process of production). It is used by governments and business in Canada, Mexico, and the United States of America. It has largely replaced the older Standard Industrial Classification ...

  3. Telephone numbers in Africa - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Africa

    List of country calling codes; List of international call prefixes; Category:Telephone numbers by country; References. International Telecommunication Union (2011-11-01). "List of ITU-T Recommendation E.164 assigned country codes" (PDF). Archived (PDF) from the original on 2012-01-31.

  4. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.

  5. Gray code - Wikipedia

    en.wikipedia.org/wiki/Gray_code

    A Gray code absolute rotary encoder with 13 tracks. Housing, interrupter disk, and light source are in the top; sensing element and support components are in the bottom. Gray codes are used in linear and rotary position encoders ( absolute encoders and quadrature encoders) in preference to weighted binary encoding.

  6. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    NNNNN for PO Boxes. NNNNN-NNNN for home delivery. A complete 13-digit code has 5-digit number representing region, sector, city, and zone; 4-digit X between 2000 and 5999; 4-digit Y between 6000 and 9999. [22] Digits of 5-digit code may represent postal region, sector, branch, section, and block respectively.

  7. TrialPay - Wikipedia

    en.wikipedia.org/wiki/TrialPay

    TrialPay. TrialPay is an alternative e-commerce payment system in which a consumer gets an item for free from a participating merchant in exchange for buying or trying out another product or service from a TrialPay advertiser. The merchant is then paid for the item by the advertiser. TrialPay refers to this payment model as “Get It Free”.