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  2. Secret Number - Wikipedia

    en.wikipedia.org/wiki/Secret_Number

    Secret Number ( Korean : 시크릿넘버; RR : Sikeuritneombeo; stylized as SECRET NUMBER) is a South Korean girl group formed by Vine Entertainment. The group debuted on May 19, 2020, with the single album Who Dis? with the five-member line up of Léa, Dita, Jinny, Soodam, and Denise. Zuu and Minji joined the group in October 2021.

  3. Bulls and cows - Wikipedia

    en.wikipedia.org/wiki/Bulls_and_Cows

    This software uses "A" to denote "bulls" (digit in the correct position) and "B" to denote "cows" (digit in the wrong position). Bulls and cows (also known as cows and bulls or pigs and bulls) is a code -breaking mind or paper and pencil game for two or more players. The game is played in turns by two opponents who aim to decipher the other's ...

  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. Secret decoder ring - Wikipedia

    en.wikipedia.org/wiki/Secret_decoder_ring

    A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [1] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...

  6. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Machine_Identification_Code

    Printer tracking dots. Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code ( MIC ), is a digital watermark which many color laser printers and copiers produce on every printed page that identifies the specific device that was used to print the document.

  7. Secret Service code name - Wikipedia

    en.wikipedia.org/wiki/Secret_Service_code_name

    Secret Service code name. President John F. Kennedy, codename "Lancer" with First Lady Jacqueline Kennedy, codename "Lace". The United States Secret Service uses code names for U.S. presidents, first ladies, and other prominent persons and locations. [1] The use of such names was originally for security purposes and dates to a time when ...

  8. 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.

  9. A Woman Hid This Secret Code in Her Silk Dress in 1888 ... - AOL

    www.aol.com/woman-hid-secret-code-her-184600296.html

    There were also numbers between the lines, each marked off with a different color and “time-like notes in the margin” of 10pm, 1113pm and 1124p. “I feel like those clues actually DO point to ...

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