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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. 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.

  4. 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 ...

  5. Pigpen cipher - Wikipedia

    en.wikipedia.org/wiki/Pigpen_cipher

    The pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) [2] [3] is a geometric simple substitution cipher, which exchanges letters for symbols which are fragments of a grid. The example key shows one way the letters can be assigned to the grid.

  6. 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 ...

  7. 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 ...

  8. International Phonetic Alphabet - Wikipedia

    en.wikipedia.org/wiki/International_Phonetic...

    It was devised by the International Phonetic Association in the late 19th century as a standardized representation of speech sounds in written form. [1] The IPA is used by lexicographers, foreign language students and teachers, linguists, speech–language pathologists, singers, actors, constructed language creators, and translators.

  9. 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.

  10. 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 ...

  11. ARPABET - Wikipedia

    en.wikipedia.org/wiki/Arpabet

    1-letter 2-letter b B b: buy C CH tʃ: China d D d: die D DH ð: thy F DX ɾ: butter L EL l̩: bottle: M EM m̩: rhythm: N EN n̩: button: f F f: fight g G ɡ: guy h HH or H: h: high J JH dʒ: jive k K k: kite l L l: lie m M m: my n N n: nigh G NX or NG: ŋ: sing — NX: ɾ̃: winner p P p: pie Q Q ʔ: uh-oh r R ɹ: rye s S s: sigh S SH ʃ: shy ...