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The sign looks like a stylised lowercase "e" and its shape, ℮, is precisely defined by the European Union Directive 2009/34/EC. It must be placed in the same field of vision as the nominal quantity. The sign has been added to the Unicode list of characters as U+212E ℮ ESTIMATED SYMBOL.
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.
The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function.It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted .
In those countries where the amount preceded the national currency sign, the euro sign is again placed in that relative position (e.g., 3,50 €). In English the euro sign – like the dollar sign $ and the pound sign £ – is usually placed before the figure, unspaced, [ 8 ] the reverse of usage in many other European languages.
The use of the letter E to denote "expected value" goes back to W. A. Whitworth in 1901. [9] The symbol has since become popular for English writers. In German, E stands for Erwartungswert, in Spanish for esperanza matemática, and in French for espérance mathématique. [10]
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
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