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  2. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  3. List of Dewey Decimal classes - Wikipedia

    en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes

    The Dewey Decimal Classification (DDC) is structured around ten main classes covering the entire world of knowledge; each main class is further structured into ten hierarchical divisions, each having ten divisions of increasing specificity. [1]

  4. List of United States Navy ratings - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States_Navy...

    Beginning in June 2016, then Master Chief Petty Officer of the Navy, Michael D. Stevens, oversaw a review of the Navy's existing enlisted rating system. [4] After Stevens's retirement, a group of senior enlisted leaders came to the conclusion that the Navy needed to replace its current enlisted system and announced the changes on 29 September 2016 with the release of NAVADMIN 218/16.

  5. Classified information in the United States - Wikipedia

    en.wikipedia.org/wiki/Classified_information_in...

    Step 3 in the classification process is to assign a reason for the classification. Classification categories are marked by the number "1.4" followed by one or more letters (a) to (h): [50] [52] 1.4(a) military plans, weapons systems, or operations; 1.4(b) foreign government information; 1.4(c) intelligence activities, sources, or methods, or ...

  6. Percent-encoding - Wikipedia

    en.wikipedia.org/wiki/Percent-encoding

    When a character from the reserved set (a "reserved character") has a special meaning (a "reserved purpose") in a certain context, and a URI scheme says that it is necessary to use that character for some other purpose, then the character must be percent-encoded.

  7. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    -To see this option, you'll need to have at least 2 recovery methods on your account . 5. Click Continue. 6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1. Sign in to your AOL account with your password. 2.

  8. ISO 3166-1 alpha-2 - Wikipedia

    en.wikipedia.org/wiki/ISO_3166-1_alpha-2

    The United Nations uses a combination of ISO 3166-1 alpha-2 and alpha-3 codes, along with codes that pre-date the creation of ISO 3166, for international vehicle registration codes, which are codes used to identify the issuing country of a vehicle registration plate; some of these codes are currently indeterminately reserved in ISO 3166-1.

  9. Sayyad (missile) - Wikipedia

    en.wikipedia.org/wiki/Sayyad_(missile)

    Sayyad-3 is a similar missile, but with a long-range capability. It has a similar diameter as Sayyad-2 but a longer body with different wings and control surfaces. Based on current estimates Sayyad-3 has a range of about 150–200 km. [10] Iranian Defence Minister Hossein Dehghan stated the maximum range is about 120 km. [11] This missile will be added to SAM systems via the TALASH-3 system. [12]