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  2. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    Therefore, a word like action would encode the number 762 (/k/-/ʃ/-/n/), not 712 (k-t-n). Double letters are disregarded when not pronounced separately, e.g. muddy encodes 31 (/m/-/d/), not 311, but midday encodes 311 (/m/-/d/-/d/) while accept encodes 7091 (/k/-/s/-/p/-/t/) since the ds and cs are pronounced separately.

  3. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    These letters have been used for multiple purposes. Originally, they referred to the leading letters of telephone exchange names.In the mid-20th century United States, before the switch to All-Number Calling, telephone numbers had seven digits including a two-digit prefix which was expressed in letters rather than digits, e.g.; KL5-5445.

  4. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    Named after the public official who announced the titles of visiting dignitaries, this cipher uses a small code sheet containing letter, syllable and word substitution tables, sometimes homophonic, that typically converted symbols into numbers. Originally the code portion was restricted to the names of important people, hence the name of the ...

  5. 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.

  6. Hexspeak - Wikipedia

    en.wikipedia.org/wiki/Hexspeak

    Further words can be made by treating some of the decimal numbers as letters - the digit " 0 " can represent the letter "O", and " 1 " can represent the letters "I" or "L". Less commonly, " 5 " can represent "S", " 7 " represent "T", " 12 " represent "R" and " 6 " or " 9 " can represent "G" or "g", respectively.

  7. Binary code - Wikipedia

    en.wikipedia.org/wiki/Binary_code

    The American Standard Code for Information Interchange (ASCII), uses a 7-bit binary code to represent text and other characters within computers, communications equipment, and other devices. Each letter or symbol is assigned a number from 0 to 127.

  8. Code 128 - Wikipedia

    en.wikipedia.org/wiki/Code_128

    A Swiss postal barcode encoding "RI 476 394 652 CH" in Code 128 (B & C) Code 128 is a high-density linear barcode symbology defined in ISO/IEC 15417:2007. [1] It is used for alphanumeric or numeric-only barcodes. It can encode all 128 characters of ASCII and, by use of an extension symbol (FNC4), the Latin-1 characters defined in ISO/IEC 8859-1 ...

  9. Specific Area Message Encoding - Wikipedia

    en.wikipedia.org/wiki/Specific_Area_Message_Encoding

    The text of the header code is a fixed format: <Preamble>ZCZC-ORG-EEE-PSSCCC+TTTT-JJJHHMM-LLLLLLLL- This is broken down as follows: 1. A preamble of binary 10101011 (0xAB in hex) repeated sixteen times, used for "receiver calibration" (i.e., clock synchronization), then the letters ZCZC as an attention to the decoder (a message activation method inherited from NAVTEX).

  10. Book cipher - Wikipedia

    en.wikipedia.org/wiki/Book_cipher

    Book cipher. A book cipher is a cipher in which each word or letter in the plaintext of a message is replaced by some code that locates it in another text, the key . A simple version of such a cipher would use a specific book as the key, and would replace each word of the plaintext by a number that gives the position where that word occurs in ...

  11. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.