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  2. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    Use of the letter x for an independent variable or unknown value. See History of algebra: The symbol x. 1637 [2] René Descartes (La Géométrie) √ ̅ .

  3. X mark - Wikipedia

    en.wikipedia.org/wiki/X_mark

    An x mark marking the spot of the wrecked Whydah Gally in Cape Cod. An X mark (also known as an ex mark or a cross mark or simply an X or ex or a cross) is used to indicate the concept of negation (for example "no, this has not been verified", "no, that is not the correct answer" or "no, I do not agree") as well as an indicator (for example, in election ballot papers or in maps as an x-marks ...

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

  5. List of typographical symbols and punctuation marks

    en.wikipedia.org/wiki/List_of_typographical...

    Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script .

  6. X - Wikipedia

    en.wikipedia.org/wiki/X

    X or x is the twenty-fourth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ex (pronounced / ˈ ɛ k s / ), plural exes .

  7. Variable (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Variable_(mathematics)

    A variable may denote an unknown number that has to be determined; in which case, it is called an unknown; for example, in the quadratic equation ax 2 + bx + c = 0, the variables a, b, c are parameters, and x is the unknown. Sometimes the same symbol can be used to denote both a variable and a constant, that is a

  8. World’s oldest writing system may have its origins in ...

    www.aol.com/mysterious-engraved-pictographs-may...

    Deciphering unknown symbols. The more researchers uncover about ancient cities such as Uruk and the connections between the iconography ancient civilizations used, the more they may be able to ...

  9. Specials (Unicode block) - Wikipedia

    en.wikipedia.org/wiki/Specials_(Unicode_block)

    The replacement character (often displayed as a black rhombus with a white question mark) is a symbol found in the Unicode standard at code point U+FFFD in the Specials table. It is used to indicate problems when a system is unable to render a stream of data to correct symbols. [6]