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2. Flashcard - Wikipedia

   en.wikipedia.org/wiki/Flashcard

   Flashcards exercise the mental process of active recall: given a prompt, one produces the answer.Beyond the content of cards, which are collected in decks, there is the question of use – how does one use the cards, in particular, how frequently does one review, and how does one react to errors, either complete failures to recall or mistakes?

3. Dagger (mark) - Wikipedia

   en.wikipedia.org/wiki/Dagger_(mark)

   In mathematics and, more often, physics, a dagger denotes the Hermitian adjoint of an operator; for example, A † denotes the adjoint of A. This notation is sometimes replaced with an asterisk, especially in mathematics. An operator is said to be Hermitian if A † = A. [35] In philology, the dagger indicates an obsolete form of a word or ...

4. Data analysis - Wikipedia

   en.wikipedia.org/wiki/Data_analysis

   A pie chart or bar chart can show the comparison of ratios, such as the market share represented by competitors in a market. [ 53 ] Deviation: Categorical subdivisions are compared against a reference, such as a comparison of actual vs. budget expenses for several departments of a business for a given time period.

5. Algorithm - Wikipedia

   en.wikipedia.org/wiki/Algorithm

   Flowchart of using successive subtractions to find the greatest common divisor of number r and s. In mathematics and computer science, an algorithm (/ ˈ æ l ɡ ə r ɪ ð əm / ⓘ) is a finite sequence of mathematically rigorous instructions, typically used to solve a class of specific problems or to perform a computation. [1]

6. Ruled paper - Wikipedia

   en.wikipedia.org/wiki/Ruled_paper

   Initially, paper was ruled by hand, sometimes using templates. [1] Scribes could rule their paper using a "hard point," a sharp implement which left embossed lines on the paper without any ink or color, [2] or could use "metal point," an implement which left colored marks on the paper, much like a graphite pencil, though various other metals were used.

7. Venn diagram - Wikipedia

   en.wikipedia.org/wiki/Venn_diagram

   A Venn diagram is a widely used diagram style that shows the logical relation between sets, popularized by John Venn (1834–1923) in the 1880s. The diagrams are used to teach elementary set theory, and to illustrate simple set relationships in probability, logic, statistics, linguistics and computer science.