E

E, or e, is the fifth letter and the second vowel letter of 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.

Name
In English, the name of the letter is the "long E" sound, pronounced. In most other languages, its name matches the letter's pronunciation in open syllables.

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 (and  in foreign words); in Greek, hê became the letter epsilon, used to represent. The various forms of the Old Italic script and the Latin alphabet followed this usage.

English
Although Middle English spelling used $⟨e⟩$ to represent long and short, the Great Vowel Shift changed long (as in me or bee) to  while short  (as in met or bed) remained a mid vowel. In unstressed syllables, this letter is usually pronounced either as or. 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, , , or some variation (such as a nasalized version) of these sounds, often with diacritics (as: $⟨e⟩$) to indicate contrasts. Less commonly, as in French, German, or Saanich, $⟨e⟩$ represents a mid-central vowel. Digraphs with $⟨e ê é è ë ē ĕ ě ẽ ė ẹ ę ẻ⟩$ are common to indicate either diphthongs or monophthongs, such as $⟨e⟩$ or $⟨e⟩$ for or  in English, $⟨ea⟩$ for  in German, and $⟨ee⟩$ for  in French or  in German.

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

Frequency
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. This makes it a harder letter to use when writing lipograms.

Other uses

 * 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.

Descendants and related characters in the Latin alphabet

 * E with diacritics: Ĕ ĕ Ḝ|Ḝ ḝ Ȇ|Ȇ ȇ Ê|Ê ê Ê̄ ê̄ Ê̌ ê̌ Ề|Ề ề Ế|Ế ế Ể|Ể ể Ễ|Ễ ễ Ệ|Ệ ệ Ẻ|Ẻ ẻ Ḙ|Ḙ ḙ Ě ě Ɇ ɇ Ė|Ė ė Ė́ ė́ Ė̃ ė̃ Ẹ ẹ Ë|Ë ë È|È è È̩ è̩ Ȅ|Ȅ ȅ É|É é É̩ Ē ē Ḕ|Ḕ ḕ Ḗ|Ḗ ḗ Ẽ|Ẽ ẽ Ḛ|Ḛ ḛ Ę|Ę ę Ę́ ę́ Ę̃ ę̃ Ȩ|Ȩ ȩ E̩ e̩ ᶒ
 * ⱸ : E with notch is used in the Swedish Dialect Alphabet
 * Æ æ : Æ|Latin AE ligature
 * Œ 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 : 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 Ə|schwa, which represents a mid central vowel in the IPA
 * Ǝ ǝ : Latin letter ǝ|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:
 * e : Subscript small e is used in Indo-European studies
 * Teuthonista phonetic transcription system symbols related to E:
 * e : Subscript small e is used in Indo-European studies
 * Teuthonista phonetic transcription system symbols related to E:
 * e : Subscript small e is used in Indo-European studies
 * Teuthonista phonetic transcription system symbols related to E:
 * e : Subscript small e is used in Indo-European studies
 * Teuthonista phonetic transcription system symbols related to E:
 * e : Subscript small e is used in Indo-European studies
 * Teuthonista phonetic transcription system symbols related to E:

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
 * : Coptic letter Ei
 * 𐌄 : Old Italic E, which is the ancestor of modern Latin E
 * : Runic letter Ehwaz, which is possibly a descendant of Old Italic E
 * : 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.

Computing

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

Other
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.