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  2. List of keyboard instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_keyboard_instruments

    A keyboard instrument is a musical instrument played using a keyboard, a row of levers which are pressed by the fingers.The most common of these are the piano, organ, and various electronic keyboards, including synthesizers and digital pianos.

  3. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten; The days of the week; e.g., TH for Thursday; Country codes; e.g., "Switzerland" can indicate the letters CH; ICAO spelling alphabet: where Mike signifies M and ...

  4. Melodica - Wikipedia

    en.wikipedia.org/wiki/Melodica

    The melodica is a handheld free-reed instrument similar to a pump organ or harmonica.It features a musical keyboard on top, and is played by blowing air through a mouthpiece that fits into a hole in the side of the instrument.

  5. Category:Chromaticism - Wikipedia

    en.wikipedia.org/wiki/Category:Chromaticism

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  6. Calliope (music) - Wikipedia

    en.wikipedia.org/wiki/Calliope_(music)

    Calliope on the Minne-Ha-Ha, a stern-wheeler on Lake George, New York Kitch Greenhouse Steam Calliope at the Ohio Historical Society – July 2006 Fairground calliope trailer being hauled by a U.S.-built traction engine – New Orleans Mardi Gras 2007 Steam calliope (c. 1901) built by George Kratz and used on the showboat French's New Sensation at The Mariners' Museum

  7. Cryptic crossword - Wikipedia

    en.wikipedia.org/wiki/Cryptic_crossword

    A 15x15 lattice-style grid is common for cryptic crosswords. A cryptic crossword is a crossword puzzle in which each clue is a word puzzle. Cryptic crosswords are particularly popular in the United Kingdom, where they originated, [1] as well as Ireland, the Netherlands, and in several Commonwealth nations, including Australia, Canada, India, Kenya, Malta, New Zealand, and South Africa.

  8. Chvátal graph - Wikipedia

    en.wikipedia.org/wiki/Chvátal_graph

    Its chromatic number is 4: it can be colored using four colors, but not using only three. It is, as Chvátal observes, the smallest possible 4-chromatic 4-regular triangle-free graph; the only smaller 4-chromatic triangle-free graph is the Grötzsch graph, which has 11 vertices but has maximum degree 5 and is not regular. [1]

  9. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    In graph-theoretic terms, the theorem states that for loopless planar graph, its chromatic number is ().. The intuitive statement of the four color theorem – "given any separation of a plane into contiguous regions, the regions can be colored using at most four colors so that no two adjacent regions have the same color" – needs to be interpreted appropriately to be correct.