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What does ε mean?
It is the fifth Greek letter and a symbol of mathematics and physics.

Mathematics: very small, Levi Zivita symbol.

Physics: dielectric constant, energy quantum.

Lower case ε is used for:

Math:

Very small

The ∈ symbol indicating "belonging" in a set relation.

Levi-Civita symbol (levi-Civita symbol)

Computer science:

blank line

Accuracy of number types

Physics: Dielectric Constant of Conductor

The phonetic symbol used in American English is the e sound of bed.

The Latin letter e is changed from Epsilon.