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[[File:Phoenician_he.svg|Phoenician he|thumb]] [[File:Phoenician_he.svg|Phoenician he|thumb|left]] [[File:Greek_Epsilon_left.svg|Greek Epsilon left|thumb|left]] [[File:Greek_Epsilon_archaic.svg|Greek Epsilon archaic|thumb]] [[File:Greek_Beta_archaic.svg|Greek Beta archaic|thumb]] '''Epsilon''' ('''Ε''' ε) is the fifth letter of the [[Greek alphabet]]. In the system of [[Greek numerals]], it has a value of 5. It was derived from the [[Phoenician alphabet]] letter [[He (letter)|He]]. Letters that arose from Epsilon include the [[Roman alphabet]]'s E and the [[Cyrillic alphabet]]'s Е.

==Etymology==
The name "epsilon" is derived from the [[Ancient Greek]] word for "simple E," to distinguish it from the [[Digamma]] which was a form of complex E in earlier forms of the Greek alphabet. The term "epsilon" could be understood as "bare E," indicating its simple pronunciation and straightforward representation.

==History==
Epsilon originally represented a [[close-mid front unrounded vowel]] (/e/), similar to the pronunciation of the modern English word "bet." In the [[Ionic dialect]], the letter came to represent the [[long vowel]] /eː/, which was a significant phonetic development in the history of the Greek language. This evolution in pronunciation marked a divergence from the original [[Phoenician alphabet]], where the precursor to epsilon represented a consonant.

==Usage in Greek Numerals==
In the system of [[Greek numerals]], epsilon has a value of 5. This numeric system was used in ancient Greece and in later Greek-speaking civilizations. The use of Greek letters for numerical values represents an early form of alphanumeric notation.

==Modern Usage==
Today, epsilon is used in various fields and contexts. In [[mathematics]], the lowercase epsilon (ε) often represents an arbitrarily small positive quantity, particularly in proofs involving limits and continuity. This usage was popularized by mathematicians in the 18th century and remains a standard notation in calculus and analysis.

In [[computer science]], epsilon typically denotes a small quantity of time or an error term. In [[linguistics]], the symbol is used to represent the [[mid front unrounded vowel]] sound, consistent with its original phonetic value in ancient Greek.

==Symbolism==
Epsilon has also been used symbolically in various contexts. In [[philosophy]], particularly in discussions involving [[Zeno's paradoxes]], epsilon represents small quantities that are almost negligible but crucial for understanding concepts of infinity and continuity.

==In Popular Culture==
Epsilon has made appearances in popular culture, often symbolizing knowledge, precision, or smallness. Its use ranges from brand names to character names in literature and media, reflecting its broad recognition beyond academic and technical communities.

[[Category:Greek alphabet]]
[[Category:Letters]]
{{Alphabet-stub}}

Epsilon - Revision history

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