Assuming it is not a variable, e is also known as Euler's Constant.
Wait a minute, Euler's Constant is something different. e is known as Euler's number (which is about 2.718...) or sometimes known as the base of the natural logarithm. Most maths people and examiners should know what 'e' is though, so you can use it in formulae safely. It's called Euler's number to prevent people getting confused with Euler's Constant. Euler's Constant however is 0.5772... (it's actually called the Euler-Mascheroni constant) which is signified by a backward 'r'. I mean no disrespect towards to previous answerer. Hope I helped
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That symbol is used for a number, which is approximately 2.718. It is one of the most important numbers in mathematics, together with pi - both appear over and over again, in many places. The number "e" is the base of the natural logarithms.
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Euler's numberThe mathematical constant 'e' (base of the natural logarithm) was discovered by Leonhard Euler. Which explains why the number 'e' is sometimes referred to as Euler's number (not Euler's constant, which is a completely different thing).Euler did not discover e although many believe he did. Roger Cotes discovered e.