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2. 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 ...

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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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

   en.wikipedia.org/wiki/Overhead_projector

   Overhead projector. An overhead projector (often abbreviated to OHP ), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience. In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film ...

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. Whiteboard - Wikipedia

   en.wikipedia.org/wiki/Whiteboard

   Whiteboard. A whiteboard (also known by the terms marker board, dry-erase board, dry-wipe board, and pen-board) is a glossy, usually white surface for making non-permanent markings. Whiteboards are analogous to blackboards, but with a smoother surface allowing for rapid marking and erasing of markings on their surface.

7. Chalkboard eraser - Wikipedia

   en.wikipedia.org/wiki/Chalkboard_eraser

   A chalkboard eraser is a special type of eraser specifically used to erase chalk markings on slating paint (used on chalkboards and slates ). It is most commonly made of felt strips attached to a handle. Chalkboard erasers are typically broad and rectangular, intended to clear large areas for new content as part of a lecture or presentation.