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  2. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    International Morse code encodes the 26 basic Latin letters A to Z, one accented Latin letter ( É ), the Arabic numerals, and a small set of punctuation and procedural signals ( prosigns ). There is no distinction between upper and lower case letters. [1]

  3. Telegraph code - Wikipedia

    en.wikipedia.org/wiki/Telegraph_code

    A telegraph code is one of the character encodings used to transmit information by telegraphy. Morse code is the best-known such code. Telegraphy usually refers to the electrical telegraph, but telegraph systems using the optical telegraph were in use before that. A code consists of a number of code points, each corresponding to a letter of the ...

  4. Tap code - Wikipedia

    en.wikipedia.org/wiki/Tap_code

    X. Y. Z. The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. The message is transmitted using a series of tap sounds, hence its name. [1] The tap code has been commonly used by prisoners to communicate with each other. The method of communicating is usually by tapping ...

  5. List of ISO 639 language codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_639_language_codes

    This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage, and some of the three-letter codes of the other sets, formerly parts 2 and 3.

  6. 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.

  7. NATO phonetic alphabet - Wikipedia

    en.wikipedia.org/wiki/NATO_phonetic_alphabet

    Letter code words with pronunciation Symbol Code word DIN 5009 (2022) IPA ICAO (1950) IPA English respelling A Alfa ˈalfa: ˈælfa: AL fah B Bravo: ˈbravo: ˈbraːˈvo BRAH voh C Charlie: ˈtʃali (or ˈʃali) ˈtʃɑːli (or ˈʃɑːli) CHAR lee (or SHAR lee) D Delta: ˈdɛlta: ˈdeltɑ: DELL tah E Echo: ˈɛko: ˈeko: ECK oh F Foxtrot ...

  8. 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.

  9. Character encoding - Wikipedia

    en.wikipedia.org/wiki/Character_encoding

    Character encoding is the process of assigning numbers to graphical characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using digital computers. [1] The numerical values that make up a character encoding are known as "code points" and collectively comprise a "code space", a ...

  10. 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.

  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.