There is a difference; The front is mathematics, reading "belonging", and the back is physics, reading "Puyi Xilong"

The fifth letter of the Greek alphabet.

Epsilon (capital ε, lowercase ε) is the fifth Greek letter.

Lower case ε is used for:

1. Math:

Very small

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

Levi-Civita symbol (levi-Civita symbol)

2. Computer science:

blank line

Accuracy of number types

3. 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.