It can be just one more variable. In calculus, both delta and epsilon are used for quantities that can assume arbitrarily small values.
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The greek letter closest to representing the latin letter e is epsilon (ɛ). In math's, epsilon is mainly used to represent very small positive numbers (e.g. when working with proofs), and used as the Levi-Civita symbol (a.k.a. the permutation symbol, used in tensor calculus, sometimes uses upper epsilon E, instead of lower epsilon ɛ). It is also often used in statistics and numerical analysis to represent errors.
if it has an equal sign then it is an equation
Epsilon Tau Pi was created in 1999.
paec is not a standard mathematical acronym.
It means that n is to be multiplied by 5