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2. Chalkboard scraping - Wikipedia

   en.wikipedia.org/wiki/Chalkboard_scraping

   Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...

3. Blackboard - Wikipedia

   en.wikipedia.org/wiki/Blackboard

   Uses. Reusable writing surface on which text or drawings are made. 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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

4. Slate (writing) - Wikipedia

   en.wikipedia.org/wiki/Slate_(writing)

   The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. [1] A slate pencil was used to write on the slate board. It was made from a softer and lighter coloured stone such as shale or chalk. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes ...

5. Dysgraphia: Signs, Diagnosis, Treatment - WebMD

   www.webmd.com/add-adhd/childhood-adhd/dysgraphia...

   Other signs of dysgraphia to watch for include: Cramped grip, which may lead to a sore hand. Difficulty spacing things out on paper or within margins (poor spatial planning) Frequent erasing ...

6. Writing lines - Wikipedia

   en.wikipedia.org/wiki/Writing_lines

   Writing lines involves copying a sentence on to a piece of standard paper or a chalkboard as many times as the punishment-giver deems necessary. The actual sentence to be copied varies but usually bears some relation to the reason the lines are being given in the first place, e.g., "I must not talk in class". [1]

7. 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, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets ( natural numbers ), ( integers ), ( rational numbers ), ( real numbers ), and ...