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  2. Mental abacus - Wikipedia

    en.wikipedia.org/wiki/Mental_abacus

    The abacus system of mental calculation is a system where users mentally visualize an abacus to carry out arithmetical calculations. [1] No physical abacus is used ...

  3. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    An abacus (pl.: abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Hindu–Arabic numeral system. [1] An abacus consists of a two-dimensional array of slidable beads (or similar objects). In their ...

  4. Three-click rule - Wikipedia

    en.wikipedia.org/wiki/Three-click_rule

    The three-click rule or three click rule is an unofficial web design rule concerning the design of website navigation. It suggests that a user of a website should be able to find any information with no more than three mouse clicks. [1]

  5. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

  6. Avolution - Wikipedia

    en.wikipedia.org/wiki/Avolution

    Website www.avolutionsoftware.com Avolution is a global provider of Enterprise Architecture , Enterprise Modeling and Process Modeling software with offices based in Sydney , Singapore , London , Dubai , Washington Metropolitan Area and New Brunswick .

  7. Logical machine - Wikipedia

    en.wikipedia.org/wiki/Logical_machine

    A logical machine or logical abacus is a tool containing a set of parts that uses energy to perform formal logic operations through the use of truth tables. Early logical machines were mechanical devices that performed basic operations in Boolean logic .

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