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  2. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

  3. Blackboard bold - Wikipedia

    en.wikipedia.org/wiki/Blackboard_bold

    Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, ...

  4. Alexander Overwijk - Wikipedia

    en.wikipedia.org/wiki/Alexander_Overwijk

    To further his claim, he would hand-draw a circle on the blackboard. In 2007, a video of Overwijk drawing a near-perfect circle for his class went viral on YouTube . [ 5 ] [ 6 ] Although the original story was a fabrication, he hosted a real "World Freehand Circle Drawing Championship" as a fundraiser for the Canadian Cancer Society following ...

  5. Simon in the Land of Chalk Drawings - Wikipedia

    en.wikipedia.org/wiki/Simon_in_the_Land_of_Chalk...

    Simon in the Land of Chalk Drawings is a British-Canadian children's animated series about the adventures of a young boy named Simon, who has a magic blackboard. [2] Things that Simon draws on the chalkboard become real in the Land of Chalk Drawings, a parallel world which Simon can enter by climbing over a fence near his home with a ladder.

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    The blackboard bold typeface is widely used for denoting the basic number systems. These systems are often also denoted by the corresponding uppercase bold letter. A clear advantage of blackboard bold is that these symbols cannot be confused with anything else. This allows using them in any area of mathematics, without having to recall their ...

  7. Chalkboard art - Wikipedia

    en.wikipedia.org/wiki/Chalkboard_art

    Chalkboard art or chalk art is the use of chalk on a blackboard as a visual art. [1] It is similar to art using pastels and related to sidewalk art that often uses chalk. Chalkboard art is often used in restaurants, shops or walls. [2] Chalkboard art has also been done on large boards while storytelling on beaches and in Churches.

  8. Sidewalk chalk - Wikipedia

    en.wikipedia.org/wiki/Sidewalk_chalk

    Chalk art by kids in the Czech Republic. On September 16–17, 2006, a global event was held to promote peace through sidewalk chalk drawings. [5] Chalk4Peace was a project planned by an artist from Arlington, Virginia named John Aaron, who asked children and teens from the age of eight to age eighteen to participate in groups across the world to draw chalk drawings that would illustrate peace ...

  9. Army Beta - Wikipedia

    en.wikipedia.org/wiki/Army_Beta

    Recruits make a rectangle out of pieces of cardboard. To administer this, the administrator draws a figure on the blackboard—then takes two pieces of cardboard and fits them together to look like the figure on the blackboard. The administrator then removes the pieces and signals the demonstrator to draw the solution on the blackboard.