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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

3. 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 ...

4. Do Not Erase: Mathematicians and Their Chalkboards

   en.wikipedia.org/wiki/Do_Not_Erase:...

   Most of the photographs show the chalkboard in a moment drawn from the mathematician's work on it, depicting how mathematicians think, work, and communicate with each other. Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted.

5. 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 ...

6. Visual communication - Wikipedia

   en.wikipedia.org/wiki/Visual_communication

   Logos, gestures, and technological signs such as emoticons, are a few examples of symbols used in culture. Semiology. The term semiology is the study of signs and symbols and their arrangements as a visual language. The characterization of what is considered a language is the existence of an alphabet that can be arranged to create meaning.

7. Clapperboard - Wikipedia

   en.wikipedia.org/wiki/Clapperboard

   Clapperboard. A clapperboard, also known as a dumb slate, clapboard, film clapper, film slate, movie slate, or production slate, is a device used in filmmaking and video production to assist in synchronizing of picture and sound, and to designate and mark the various scenes and takes as they are filmed and audio-recorded.