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  2. Pigpen cipher - Wikipedia

    en.wikipedia.org/wiki/Pigpen_cipher

    The pigpen cipher uses graphical symbols assigned according to a key similar to the above diagram. [1]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.

  3. Cyrillic O variants - Wikipedia

    en.wikipedia.org/wiki/Cyrillic_O_variants

    Broad On. Broad On, also known as Round Omega (Ѻ ѻ; italics: Ѻ ѻ) is a positional and orthographical variant of the Cyrillic O. On (ѻнъ, onŭ) is a traditional name of Cyrillic letter О; these names are still in use in the Church Slavonic alphabet. Broad On is used only in the Church Slavonic language. In its alphabet (in primers and ...

  4. Calculator spelling - Wikipedia

    en.wikipedia.org/wiki/Calculator_spelling

    Calculator spelling. Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred ...

  5. 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 ...

  6. Classical cipher - Wikipedia

    en.wikipedia.org/wiki/Classical_cipher

    Classical cipher. In cryptography, a classical cipher is a type of cipher that was used historically but for the most part, has fallen into disuse. In contrast to modern cryptographic algorithms, most classical ciphers can be practically computed and solved by hand. However, they are also usually very simple to break with modern technology.

  7. List of Cyrillic letters - Wikipedia

    en.wikipedia.org/wiki/List_of_Cyrillic_letters

    This is a list of letters of the Cyrillic script. The definition of a Cyrillic letter for this list is a character encoded in the Unicode standard that a has script property of 'Cyrillic' and the general category of 'Letter'. An overview of the distribution of Cyrillic letters in Unicode is given in Cyrillic script in Unicode.

  8. Algebraic notation (chess) - Wikipedia

    en.wikipedia.org/wiki/Algebraic_notation_(chess)

    Algebraic notation. Algebraic notation is the standard method for recording and describing the moves in a game of chess. It is based on a system of coordinates to uniquely identify each square on the board. [1] It is now almost universally used by books, magazines, newspapers and software, and is the only form of notation recognized by FIDE ...

  9. Trifid cipher - Wikipedia

    en.wikipedia.org/wiki/Trifid_cipher

    The trifid cipher is a classical cipher invented by Félix Delastelle and described in 1902. [1] Extending the principles of Delastelle's earlier bifid cipher, it combines the techniques of fractionation and transposition to achieve a certain amount of confusion and diffusion: each letter of the ciphertext depends on three letters of the plaintext and up to three letters of the key.