E
E, or e, is the fifth letter and the second vowel letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is e (pronounced ); plural es, Es or E's. It is the most commonly used letter in many languages, including Czech, Danish, Dutch, English, French, German, Hungarian, Latin, Latvian, Norwegian, Spanish, and Swedish.

History
The Latin letter 'E' differs little from its source, the Greek letter epsilon, 'Ε'. This in turn comes from the Semitic letter hê, which has been suggested to have started as a praying or calling human figure (hillul 'jubilation'), and was most likely based on a similar Egyptian hieroglyph that indicated a different pronunciation. In Semitic, the letter represented /h/ (and /e/ in foreign words); in Greek, hê became the letter epsilon, used to represent /e/. The various forms of the Old Italic script and the Latin alphabet followed this usage.

Use in writing systems
English
Although Middle English spelling used ⟨e⟩ to represent long and short /e/, the Great Vowel Shift changed long /eː/ (as in 'me' or 'bee') to /iː/ while short /ɛ/ (as in 'met' or 'bed') remained a mid vowel. In other cases, the letter is silent, generally at the end of words like queue.

Other languages
In the orthography of many languages it represents either [e], [e̞], [ɛ], or some variation (such as a nasalized version) of these sounds, often with diacritics (as: ⟨e ê é è ë ē ĕ ě ẽ ė ẹ ę ẻ⟩) to indicate contrasts. Less commonly, as in French, German, or Saanich, ⟨e⟩ represents a mid-central vowel /ə/. Digraphs with ⟨e⟩ are common to indicate either diphthongs or monophthongs, such as ⟨ea⟩ or ⟨ee⟩ for /iː/ or /eɪ/ in English, ⟨ei⟩ for /aɪ/ in German, and ⟨eu⟩ for /ø/ in French or /ɔɪ/ in German.

Other systems
The International Phonetic Alphabet uses ⟨e⟩ for the close-mid front unrounded vowel or the mid front unrounded vowel.

Most common letter
'E' is the most common (or highest-frequency) letter in the English language alphabet and several other European languages, which has implications in both cryptography and data compression. In the story "The Gold-Bug" by Edgar Allan Poe, a character figures out a random character code by remembering that the most used letter in English is E. This makes it a hard and popular letter to use when writing lipograms. Ernest Vincent Wright's Gadsby (1939) is considered a "dreadful" novel, and supposedly "at least part of Wright's narrative issues were caused by language limitations imposed by the lack of E." Both Georges Perec's novel A Void (La Disparition) (1969) and its English translation by Gilbert Adair omit 'e' and are considered better works.

Related characters
Descendants and related characters in the Latin alphabet
E with diacritics: Ĕ ĕ Ḝ ḝ Ȇ ȇ Ê ê Ê̄ ê̄ Ê̌ ê̌ Ề ề Ế ế Ể ể Ễ ễ Ệ ệ Ẻ ẻ Ḙ ḙ Ě ě Ɇ ɇ Ė ė Ė́ ė́ Ė̃ ė̃ Ẹ ẹ Ë ë È è È̩ è̩ Ȅ ȅ É é É̩ Ē ē Ḕ ḕ Ḗ ḗ Ẽ ẽ Ḛ ḛ Ę ę Ę́ ę́ Ę̃ ę̃ Ȩ ȩ E̩ e̩ ᶒ
ⱸ : E with notch is used in the Swedish Dialect Alphabet
Æ æ : Latin AE ligature
Œ œ : Latin OE ligature
The umlaut diacritic ¨ used above a vowel letter in German and other languages to indicate a fronted or front vowel (this sign originated as a superscript e)
Phonetic alphabet symbols related to E (the International Phonetic Alphabet only uses lowercase, but uppercase forms are used in some other writing systems):
Ɛ ɛ : Latin letter epsilon / open e, which represents an open-mid front unrounded vowel in the IPA
ᶓ : Epsilon / open e with retroflex hook
Ɜ ɜ : Latin letter reversed epsilon / open e, which represents an open-mid central unrounded vowel in the IPA
ɝ : Latin small letter reversed epsilon / open e with hook, which represents a rhotacized open-mid central vowel in the IPA
ᶔ : Reversed epsilon / open e with retroflex hook
ᶟ : Modifier letter small reversed epsilon / open e
ɞ : Latin small letter closed reversed open e, which represents an open-mid central rounded vowel in IPA (shown as ʚ on the 1993 IPA chart)
𐞏 : Modifier letter small closed reversed open e, which is a superscript IPA letter
Ə ə : Latin letter schwa, which represents a mid central vowel in the IPA
Ǝ ǝ : Latin letter turned e, which is used in the writing systems of some African languages
ɘ : Latin letter reversed e, which represents a close-mid central unrounded vowel in the IPA
𐞎 : Modifier letter small reversed e, which is a superscript IPA letter
The Uralic Phonetic Alphabet uses various forms of e and epsilon / open e:U+1D07 ᴇ LATIN LETTER SMALL CAPITAL E
U+1D08 ᴈ LATIN SMALL LETTER TURNED OPEN E
U+1D31 ᴱ MODIFIER LETTER CAPITAL E
U+1D32 ᴲ MODIFIER LETTER CAPITAL REVERSED E
U+1D49 ᵉ MODIFIER LETTER SMALL E
U+1D4B ᵋ MODIFIER LETTER SMALL OPEN E
U+1D4C ᵌ MODIFIER LETTER SMALL TURNED OPEN E
U+2C7B ⱻ LATIN LETTER SMALL CAPITAL TURNED E
e : Subscript small e is used in Indo-European studies
Teuthonista phonetic transcription system symbols related to E:U+AB32 ꬲ LATIN SMALL LETTER BLACKLETTER E
U+AB33 ꬳ LATIN SMALL LETTER BARRED E
U+AB34 ꬴ LATIN SMALL LETTER E WITH FLOURISH

Ancestors and siblings in other alphabets
𐤄 : Semitic letter He (letter), from which the following symbols originally derive
Ε ε : Greek letter Epsilon, from which the following symbols originally derive
Е е : Cyrillic letter Ye
Є є : Ukrainian Ye
Э э : Cyrillic letter E
Ⲉ ⲉ : Coptic letter Ei
𐌄 : Old Italic E, which is the ancestor of modern Latin E
ᛖ : Runic letter Ehwaz, which is possibly a descendant of Old Italic E
𐌴 : Gothic letter eyz

Derived signs, symbols and abbreviations
€ : Euro sign.
℮ : Estimated sign (used on prepackaged goods for sale within the European Union).
e : the symbol for the elementary charge (the electric charge carried by a single proton)
∃ : existential quantifier in predicate logic. It is read "there exists ... such that".
∈ : the symbol for set membership in set theory.
𝑒 : the base of the natural logarithm.

Code points
1 Also for encodings based on ASCII, including the DOS, Windows, ISO-8859 and Macintosh families of encodings.

Other representations
In British Sign Language (BSL), the letter 'e' is signed by extending the index finger of the right hand touching the tip of index on the left hand, with all fingers of left hand open.

Use as a number
In the hexadecimal (base 16) numbering system, "E" corresponds to the number 14 in decimal (base 10) counting.
"e" is also commonly used to denote Euler's number.

See also
"E notation" is used by scientific calculators to indicate a power of ten multiplier.
E-number – Codes for food additivesPages displaying short descriptions of redirect targets

References
External links
 Media related to E at Wikimedia Commons
 The dictionary definition of E at Wiktionary
 The dictionary definition of e at Wiktionary