Ε
Symbol  Format  Data 

Ε  Code Point 
U+0395 
TeX 
\Epsilon 

SVG 
The capital Greek letter (capital epsilon) is visually very similar to the uppercase Latin letter E. For that reason, refer to the usage of Capital E for how the symbol appears in math.
The ε (epsilon) symbol is a Greek letter used in math as a variable to represent error bounds and in calculus to represent the epsilondelta definition of limits.