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It's the Greek letter that looks like E (similar to €)
the 5th letter of the greek alphabet (aka e in english)
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.
Epsilon Tau Pi was created in 1999.
That is the Greek letter Epsilon which indicates summation.