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  2. Currency symbol - Wikipedia

    en.wikipedia.org/wiki/Currency_symbol

    The modern dollar and peso symbols originated from the mark employed to denote the Spanish dollar, [2] whereas the pound and lira symbols evolved from the letter L (written until the seventeenth century in blackletter type as ) standing for libra, a Roman pound of silver.

  3. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  4. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

    The circumference of a circle with diameter 1 is π.. A mathematical constant is a number whose value is fixed by an unambiguous definition, often referred to by a special symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  5. What’s the Profitability Index (PI) and How Is It Calculated?

    www.aol.com/finance/profitability-index-pi...

    Similar to PI, investors use NPV to determine whether a project is likely to add value to their portfolio. But, NPV assesses the absolute profitability of a project while PI is used to compare the ...

  6. Chronology of computation of π - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_computation...

    1 TB SATA II (Boot drive) – Hitachi (HDS721010CLA332), 3× 2 TB SATA II (Store Pi Output) – Seagate (ST32000542AS) 16× 2 TB SATA II (Computation) – Seagate (ST32000641AS) Windows Server 2008 R2 Enterprise (x64) Computation of binary digits: 80 days; Conversion to base 10: 8.2 days; Verification of the conversion: 45.6 hours

  7. Real and nominal value - Wikipedia

    en.wikipedia.org/wiki/Real_and_nominal_value

    In economics, nominal value refers to value measured in terms of absolute money amounts, whereas real value is considered and measured against the actual goods or services for which it can be exchanged at a given time.

  8. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  9. Piastre - Wikipedia

    en.wikipedia.org/wiki/Piastre

    Piastre was also the original French word for the United States dollar, used for example in the French text of the Louisiana Purchase. Calling the US dollar a piastre is still common among speakers of Cajun French and New England French. Modern French uses dollar for this unit of currency as well.