e (EN)

letter, symbol

letter “e”

1. the lowercase form of the letter "E"
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   In the word "elephant," the letter "e" appears twice.

symbol “e”

1. Euler's number
   The value of e, approximately 2.718, is crucial in calculating continuous growth rates.
2. a symbol used in scientific notation to separate mantissa from the exponent
   The number 5 billion can be written in scientific notation as 5e9.
3. a symbol for an electron in physics
   In a hydrogen atom, the e orbits the nucleus at incredible speeds.
4. a symbol for the charge of a single electron in physics
   The value of e is approximately 1.6 x 10^-19 coulombs.
5. a mathematical symbol for eccentricity (how much a shape's path deviates from being circular)
   In a circle, the e = 0 because all points are equidistant from the center.