The fifth letter of the Roman alphabet,
E
is derived from the Greek letter
epsilon which is much the same in appearance (ε, ε) and function. The Semitic ''hê'' probably first represented a praying or calling human figure. In Semitic, the letter was pronounced /h/ (in foreign words also /e/), in Greek ''hê'' became Εψιλον (epsilon) with the value /e/. Etruscans and Romans followed this usage. Due to the
Great_Vowel_Shift, English usage is rather different, namely /i:/ in ME or BEE, whereas other words like BED are quite close to Latin or Continental European usage.
Like other Latin vowels, e came in a long (sounded as in th''ey'') and a short variety (sounded as in p''e''t). In other languages which use the letter it takes on various other values, sometimes with accents to indicate which one (ê,é,è,ë).
On computers the uppercase letter is represented with
ASCII code 69 and the lowercase letter with code 101. This is the most common letter in
English and many related languages, which has some implications in
Cryptography.
Echo represents the letter E in the
NATO_phonetic_alphabet.
Meanings for E
In biochemistry, E is often an abbreviation for enzyme.
In computing, the letter e (with or without a subsequent hyphen) is often used as a prefix for other words to imply "electronic," such as e-mail or e-commerce.
In currency, e is commonly used symbol for the euro when the symbol € is not available.
In English slang, e is often used as an abbreviation of ecstasy, a synthetic drug.
In film, ''E'' is a Canadian film from 1982; see E (film).
In finance securities, E is stock_symbol for ENI_Spa
In gender-neutral_pronouns, e is the Spivak_pronoun meaning ''he or she''.
In international licence plate codes, E stands for Spain (España).
In mathematics,
e is Euler's number, a transcendental_number (approximately equal to 2.71828182846) which is used as the base for natural_logarithms. See e (mathematical constant).
E is also used to signify ×10x; i.e. 7e8 is 7×108 or 700,000,000.
E is often used as a digit meaning ''fourteen'' in hexadecimal and other positional numeral_systems with a radix of 15 or greater.
In the Metric_system, E, exa, is the SI_prefix meaning 1018.
In music, E is a note.
In physics, E is,
The symbol for energy, as in E=mc^2.
The symbol for electric_field.
In probability and statistics, a capital E denotes expected_value.
In symbolic_logic \exists (a backwards E) is the symbol for "there exists...", called the existential_quantifier. Example: \exists x x+1=3.
In video_games, E is the ESRB rating symbol for Everyone.
鄂, or È is an abbreviation for the Hubei province of the People's_Republic_of_China.
Two-letter combinations starting with E:
ea eb ec ed ee ef eg eh ei ej ek el em en eo ep eq er es et eu ev ew ex ey ez
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