Something of little importance, especially an inconsequential effort or action as compared to a huge problem.
Something negligible or insignificant.
In IPA, the phonetic symbol ɛ that represents the open-mid front unrounded vowel.
The name for the fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
A small child.
Yes, we have to convert all the symbol names to upper case at startup, but that’s epsilon.
The percentage change in an option value with respect to the underlying dividend yield.
An arbitrarily small quantity.