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  2. North American Numbering Plan expansion - Wikipedia

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

    The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.

  3. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate with the NANP.

  4. MasterFormat - Wikipedia

    en.wikipedia.org/wiki/MasterFormat

    MasterFormat is a standard for organizing specifications and other written information for commercial and institutional building projects in the U.S. and Canada. [1] Sometimes referred to as the "Dewey Decimal System" of building construction, MasterFormat is a product of the Construction Specifications Institute (CSI) and Construction Specifications Canada (CSC).

  5. Talk : List of North American Numbering Plan area codes

    en.wikipedia.org/wiki/Talk:List_of_North...

    There are also 80 area codes reserved for future expansion of the numbering system, that is, those whose middle digit is 9. Article North American Numbering Plan expansion tells how they might be used. This makes a total of 322 currently unused area codes, or 40% of the total space of 800 possible area codes.

  6. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter type developed predominantly in Europe.

  7. United States Numbered Highway System - Wikipedia

    en.wikipedia.org/wiki/United_States_Numbered...

    A preliminary numbering system, with eight major east–west and ten major north–south routes, was deferred to a numbering committee "without instructions". [ 1 ] After working with states to get their approval, the committee expanded the highway system to 75,800 miles (122,000 km), or 2.6% of total mileage, over 50% more than the plan ...

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