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  2. T9 (predictive text) - Wikipedia

    en.wikipedia.org/wiki/T9_(predictive_text)

    Keypad used by T9. T9's objective is to make it easier to enter text messages.It allows words to be formed by a single keypress for each letter, which is an improvement over the multi-tap approach used in conventional mobile phone text entry at the time, in which several letters are associated with each key, and selecting one letter often requires multiple keypresses.

  3. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Morse code. 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] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .

  4. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...

  5. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    Numzi - free web application for converting numbers to words/phrases and vice versa using the Major System. Covers the English language with over 220,000 words. Numzi also has an iOS app which is a portable Major System number-word converter. 2Know is free Windows software for converting numbers to words (English, German, French).

  6. Nihilist cipher - Wikipedia

    en.wikipedia.org/wiki/Nihilist_cipher

    Nihilist cipher. In the history of cryptography, the Nihilist cipher is a manually operated symmetric encryption cipher, originally used by Russian Nihilists in the 1880s to organize terrorism against the tsarist regime. The term is sometimes extended to several improved algorithms used much later for communication by the First Chief ...

  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. Phoneword - Wikipedia

    en.wikipedia.org/wiki/Phoneword

    Phoneword. Many telephone keypads have letters with the numbers, from which words can be formed. Sign in Argentina giving the number 0800 555 8736 as 0800 555 TREN. Phonewords are mnemonic phrases represented as alphanumeric equivalents of a telephone number. [1] In many countries, the digits on the telephone keypad also have letters assigned.

  9. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    Caesar cipher. The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext. In cryptography, a Caesar cipher, also known as Caesar's ...

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