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  2. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  3. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    Modern two-letter abbreviated codes for the states and territories originated in October 1963, with the issuance of Publication 59: Abbreviations for Use with ZIP Code, three months after the Post Office introduced ZIP codes in July 1963.

  4. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    The last four digits identify an area within the post office. For example, 00716-2604: 00716-for the east section of the city of Ponce and 2604 for Aceitillo St. in the neighborhood of Los Caobos. US Post office is changing the PR address format to the American one: 1234 No Name Avenue, San Juan, PR 00901. Qatar: QA: no codes Réunion: RE: 974NN

  5. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    For fixed line and mobile phone numbers, a dash is written in between the area/mobile code and the subscriber number, with an optional space before the last four digits of the subscriber number. For example, a fixed line number in Kuala Lumpur is written as 03-XXXX YYYY or 03-XXXXYYYY, while a fixed line number in Kota Kinabalu is written as ...

  6. List of U.S. government and military acronyms - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._government...

    List of initialisms, acronyms ("words made from parts of other words, pronounceable"), and other abbreviations used by the government and the military of the United States. Note that this list is intended to be specific to the United States government and military—other nations will have their own acronyms.

  7. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Conventional abbreviations for US cities and states: for example, "New York" can indicate NY and "California" CA or CAL. The abbreviation is not always a short form of the word used in the clue. For example: "Knight" for N (the symbol used in chess notation)

  8. Abbreviated dialing - Wikipedia

    en.wikipedia.org/wiki/Abbreviated_dialing

    The most commonly known examples are emergency telephone numbers such as 9-9-9, 1-1-2 and 9-1-1.Other services may also be available through abbreviated dialing numbers, such as the other of the eight N11 codes of the North American Numbering Plan (NANP) besides 9-1-1. [1]

  9. List of telephony terminology - Wikipedia

    en.wikipedia.org/wiki/List_of_telephony_terminology

    Number 1 Electronic Switching System (Alcatel-Lucent) US 1FR: Flat rate service: US 2G: second-generation mobile telephone 2.5G: Enhanced 2G mobile telephone 3G: third-generation mobile telephone 4ESS Number 4 Electronic Switching System (Alcatel-Lucent) 4WTS: Four-wire termination set: US 5ESS Number 5 Electronic Switching System (Alcatel ...