ER or Er may refer to:
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PeopleEdit
- Er (biblical person), the eldest son of Judah in the biblical book of Genesis
- Nie Er (1912–1935), Chinese composer
- Elliot Rodger (July 24, 1991 – May 23, 2014), English-American incel mass shooter
- A Royal cypher representing a monarch
- Elizabeth Regina (ER), the royal cypher of Elizabeth I
- Edward Rex (ER / EVIIR), the royal cypher of Edward VII
- Edward Rex (ER / EVIIIR), the royal cypher of Edward VIII
- Elizabeth II Regina (EIIR), the royal cypher of Elizabeth II
Fictional charactersEdit
- Er, a character in Plato's Myth of Er
Arts, entertainment and mediaEdit
MusicEdit
- Er, an album by Nils Petter Molvær
- "ER" (song), a 2012 single by Japanese boy band Kanjani Eight
- "ER", a song by Royce da 5'9" featuring Kid Vishis from Success Is Certain
PeriodicalsEdit
- Chico Enterprise-Record, the daily newspaper of Chico, California
TelevisionEdit
- ER (TV series), a 1994–2009 American television medical drama series
- E/R, a 1984–1985 American television sitcom
Businesses and organizationsEdit
- Astar Air Cargo (IATA designator ER)
- Eastern Railway (India)
- Entre Ríos Railway in Argentina (reporting mark ER)
- Estonian Reform Party
Finance and bankingEdit
- ER, abbreviation of exchange rate
- ER, abbreviation of expense ratio
LanguageEdit
- Er (Cyrillic) (Р / р), a letter of the Cyrillic alphabet corresponding to the Latin letter "R"
- Er (cuneiform), a sign in cuneiform writing
- "er", a filler word in English
- Er, alternate spelling for Yer (Ъ / ъ), the hard-sign letter of the Cyrillic alphabet
- Suffix -er
- -er, a suffix added to adjectives or adverbs to form a comparative (e.g., fast to faster)
- -er, a suffix added to a noun to indicate resident of, as in New Yorker
- -er, a suffix added to a verb to make it an agent noun (e.g., cut to cutter)
- Oxford "-er", a suffix used to form words like rugger and footer
- Erhua (儿化), rhotacization of spoken syllables in Beijing dialect of Mandarin Chinese with the -er suffix (儿)
Science and technologyEdit
Biology and medicineEdit
- Emergency room, or emergency department, in a medical facility
- Endoplasmic reticulum, a type of organelle in cell biology
- Er blood group system
- Equine exertional rhabdomyolysis, a syndrome that damages muscle tissue in horses
- Estrogen receptor, a type of protein molecule
- Extraction ratio, a pharmacokinetic property
Chemistry and physicsEdit
- <math>\epsilon_r</math>, a representation for relative static permittivity
- Electrorheological (ER) fluid, a type of chemical suspension
- Enantiomeric ratio, a concept in chemistry
- Erbium, symbol Er, a chemical element
- Einstein-Rosen bridge (ER) relativistic wormholes
ComputingEdit
- .er, country code top-level domain (ccTLD) for Eritrea
- Entity–relationship model, a conceptual representation of data
- Error Resilience, an audio coding method used in MPEG-4 Part 3
Other usesEdit
- Eritrea (ISO 3166-2 two letter country code)
- Er., Hebrew abbreviation for 'Eruvin, the second tractate of Moed
- Earned run, a term in the game of baseball
- Emergency Response, incident response team or emergency procedure related to emergency services
- English Reports of the English Courts from 1220 to 1866