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Epsilon (uppercase ?, lowercase ?) is the fifth letter of the Greek
alphabet, corresponding phonetically to a close-mid front unrounded vowel
/e/. In the system of Greek numerals it has a value of 5. It was derived
from the Phoenician letter He . Letters that arose from Epsilon include the
Roman E and Cyrillic Ye.
"Epsilon" (, "simple e") was coined to distinguish the letter from ??,
which by the medieval period was pronounced the same way.
The standard symbol for lowercase epsilon is the lunate epsilon ? (epsilon
in MathML), which has its origins in Medieval Greek.
In mathematical notation, the minuscule open e symbol ? (varepsilon in
MathML) from the extended Latin alphabet is often used interchangeably with
the lunate epsilon.
The lunate epsilon ? is not to be confused with the set symbol ? or fal
