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2. 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.

3. Calculator spelling - Wikipedia

   en.wikipedia.org/wiki/Calculator_spelling

   Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred to as beghilos (or ...

4. Mathematical joke - Wikipedia

   en.wikipedia.org/wiki/Mathematical_joke

   Calculator spelling is the formation of words and phrases by displaying a number and turning the calculator upside down. [33] The jest may be formulated as a mathematical problem where the result, when read upside down, appears to be an identifiable phrase like " ShELL OIL " or " Esso " using seven-segment display character representations ...

5. Inverse Pythagorean theorem - Wikipedia

   en.wikipedia.org/wiki/Inverse_Pythagorean_theorem

   In geometry, the inverse Pythagorean theorem (also known as the reciprocal Pythagorean theorem [1] or the upside down Pythagorean theorem [2]) is as follows: [3] Let A, B be the endpoints of the hypotenuse of a right triangle ABC. Let D be the foot of a perpendicular dropped from C, the vertex of the right angle, to the hypotenuse. Then

6. Upside potential ratio - Wikipedia

   en.wikipedia.org/wiki/Upside_potential_ratio

   The upside-potential ratio is a measure of risk-adjusted returns. All such measures are dependent on some measure of risk. In practice, standard deviation is often used, perhaps because it is mathematically easy to manipulate. However, standard deviation treats deviations above the mean (which are desirable, from the investor's perspective ...

7. Calculator added up to fun for a math phobic kid in the 1970s ...

   www.aol.com/calculator-added-fun-math-phobic...

   Apparently, if you input certain numbers and turned the calculator upside-down, it formed amusing words. Well, amusing to us anyway. If you punched in 71077345 and flipped the device, it gave a ...

8. Windows Calculator - Wikipedia

   en.wikipedia.org/wiki/Windows_Calculator

   A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.

9. Ambigram - Wikipedia

   en.wikipedia.org/wiki/Ambigram

   Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Also, palindromic numbers and strobogrammatic numbers sometimes attract attention of mathematician ambigrammists.