Analysis of information sources in references of the Wikipedia article "Epsilon" in English language version.
Inspiration for the € symbol itself came from the Greek epsilon, ϵ – a reference to the cradle of European civilization – and the first letter of the word Europe, crossed by two parallel lines to 'certify' the stability of the euro.
ε linear strain
In mathematics, a small positive infinitesimal quantity, usually denoted ε or ϵ, whose limit is usually taken as ϵ->0.