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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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

    [8] [10] The notation caught on: blackboard bold spread from classroom to classroom and is now used around the world. [8] A page from Loomis & Sternberg (1968), showing an early example of "blackboard bold" style R and C in a printed book. [11] The style made its way into print starting in the mid 1960s.

  4. 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.

  5. Bulletin board - Wikipedia

    en.wikipedia.org/wiki/Bulletin_board

    The terms bulletin board, message board and even Internet forum are interchangeable, although often one bulletin board or message board can contain a number of Internet forums or discussion groups. An online board can serve the same purpose as a physical bulletin board, with the added benefit of not being bound by geographical location.

  6. 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 ...

  7. Theory of forms - Wikipedia

    en.wikipedia.org/wiki/Theory_of_forms

    The Forms are perfect and unchanging representations of objects and qualities. For example, the Form of beauty or the Form of a triangle. For the form of a triangle say there is a triangle drawn on a blackboard. A triangle is a polygon with 3 sides. The triangle as it is on the blackboard is far from perfect.

  8. Chalkboard paint - Wikipedia

    en.wikipedia.org/wiki/Chalkboard_Paint

    Chalkboard paint is a specialized paint that creates a chalkboard-like coating that can be utilized as a writing surface in the same manner as a traditional chalkboard. Chalkboard paint is commonly made out of a mixture of talc , [ 1 ] [ 2 ] acrylic , [ 1 ] water , glycol , titanium dioxide , [ 3 ] carbon black , [ 4 ] opacifiers , silica , [ 2 ...

  9. Glossary of mathematical symbols - Wikipedia

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

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

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