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  2. 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 ...

  3. D-Day Daily Telegraph crossword security alarm - Wikipedia

    en.wikipedia.org/wiki/D-Day_Daily_Telegraph...

    On 18 August 1942, a day before the Dieppe raid, 'Dieppe' appeared as an answer in The Daily Telegraph crossword (set on 17 August 1942) (clued "French port"), causing a security alarm. The War Office suspected that the crossword had been used to pass intelligence to the enemy and called upon Lord Tweedsmuir, then a senior intelligence officer ...

  4. Hidden message - Wikipedia

    en.wikipedia.org/wiki/Hidden_message

    Hidden messages include backwards audio messages, hidden visual messages and symbolic or cryptic codes such as a crossword or cipher. Although there are many legitimate examples of hidden messages created with techniques such as backmasking and steganography, many so-called hidden messages are merely fanciful imaginings or apophany .

  5. 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.

  6. List of Latin phrases (full) - Wikipedia

    en.wikipedia.org/wiki/List_of_Latin_phrases_(full)

    Translation Notes a bene placito: from one well pleased: i.e., "at will" or "at one's pleasure". This phrase, and its Italian (beneplacito) and Spanish (beneplácito) derivatives, are synonymous with the more common ad libitum (at pleasure). a capite ad calcem: from head to heel: i.e., "from top to bottom", "all the way through", or "from head ...

  7. Code talker - Wikipedia

    en.wikipedia.org/wiki/Code_talker

    Code talker. Choctaw soldiers in training in World War I for coded radio and telephone transmissions. A code talker was a person employed by the military during wartime to use a little-known language as a means of secret communication. The term is most often used for United States service members during the World Wars who used their knowledge ...

  8. What 'secret' loudspeaker codes mean at department stores - AOL

    www.aol.com/news/2010-10-13-what-secret...

    This "code" is one of many innocuous sounding secret codes that. ... 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Mail. Sign in. Subscriptions; Animals.

  9. Llanfairpwllgwyngyll - Wikipedia

    en.wikipedia.org/wiki/Llanfairpwllgwyngyll

    The name was submitted to Guinness World Records as the longest word to appear in a published cryptic crossword, having been used by compiler Roger Squires in 1979. The clue was "Giggling troll follows Clancy, Larry, Billy and Peggy who howl, wrongly disturbing a place in Wales (58)", where all but the last five words formed an anagram.