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  2. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon. Racon signal as seen on a radar screen. This beacon receives using sidelobe suppression and transmits the letter "Q" in Morse code near Boston Harbor (Nahant) 17 January 1985. Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1 ...

  3. DEA number - Wikipedia

    en.wikipedia.org/wiki/DEA_number

    A valid DEA number consists of: 2 letters, 6 numbers, and 1 check digit. The first letter is a code identifying the type of registrant (see below) The second letter is the first letter of the registrant's last name, or "9" for registrants using a business address instead of name. Of the seven digits that follow, the seventh digit is a "checksum ...

  4. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  5. EXIT chart - Wikipedia

    en.wikipedia.org/wiki/EXIT_chart

    EXIT chart. An extrinsic information transfer chart, commonly called an EXIT chart, is a technique to aid the construction of good iteratively-decoded error-correcting codes (in particular low-density parity-check (LDPC) codes and Turbo codes ). EXIT charts were developed by Stephan ten Brink, building on the concept of extrinsic information ...

  6. List of aircraft registration prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft...

    4L-10000 to 4L-99999. Germany. D [ 3] D-AAAA to D-AZZZ for aircraft with more than 20 t MTOW. D-AUAA to D-AZZZ (test registrations) for aircraft manufactured by Airbus at Finkenwerder. D-BAAA to D-BZZZ for aircraft with 14–20 t MTOW. D-CAAA to D-CZZZ for aircraft with 5.7–14 t MTOW.

  7. Non-printing character in word processors - Wikipedia

    en.wikipedia.org/wiki/Non-printing_character_in...

    Nonprinting characters or formatting marks are characters for content designing in word processors, which are not displayed at printing. It is also possible to customize their display on the monitor. The most common nonprintable characters in word processors are pilcrow, space, nonbreaking space, tab character etc. [1] [2]

  8. Template:Unicode chart Number Forms - Wikipedia

    en.wikipedia.org/wiki/Template:Unicode_chart...

    2. ^ Grey areas indicate non-assigned code points Template documentation [ view ] [ edit ] [ history ] [ purge ] {{ Unicode chart Number Forms }} provides a list of Unicode code points in the Number Forms block.

  9. Two-letter country codes - Wikipedia

    en.wikipedia.org/wiki/Two-letter_country_codes

    Two-letter country codes. Two-letter country codes are used to represent countries and states (often both widely recognized and not) as a code of two letters. ISO 3166-1 alpha-2 is the main set of two-letter country codes that is currently used. This standard set of codes is a part of ISO 3166-1, also maintains a list of three-letter codes for ...