er

ER or Er may refer to:

Arts and entertainment

• , a 1994–2009 American television medical drama series
• E/R, a 1984–1985 American television sitcom
• "ER" (song), a 2012 single by Japanese boy band Kanjani Eight
• Er, an album by Nils Petter Molvær
• "ER", a song by Royce da 5'9" featuring Kid Vishis from Success Is Certain
• Chico Enterprise-Record, the daily newspaper of Chico, California

Businesses and organizations

• Eldorado Reno, a hotel and casino in Reno, Nevada
• Eldorado Resorts, a gaming company located in Reno, Nevada
• Entre Ríos Railway in Argentina (reporting mark ER)
• Estonian Reform Party
• Astar Air Cargo (IATA designator ER)
• Edinaya Rossiya, a Russian political party

Finance and banking

• Abbreviation of exchange rate
• Abbreviation of expense ratio

Language

• -er, a suffix added to adjectives or adverbs to form a comparative (e.g. fast to faster)
• -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
• "er", a filler (linguistics)
• Er (Cyrillic) (Р / р), a letter of the Cyrillic alphabet corresponding to the Latin letter "R"
• Er, alternate spelling for Yer (Ъ / ъ), the hard-sign letter of the Cyrillic alphabet

People

• Er (biblical person), the eldest son of Judah in the biblical book of Genesis
• Er, a character in Plato's Myth of Er
• Èrs people, an ancient people inhabiting parts of what are now northern Armenia, northeast Turkey, southern Georgia, and northwest Azerbaijan
• Nie Er (1912–1935), Chinese composer
• Elizabeth Regina (ER or EIIR), the royal cypher of Queen Elizabeth II
• Edward Rex (ER or EVIIR), the royal cypher of King Edward VII

Places

• Eritrea (ISO 3166-2:ER country code)
• East Rochester, New York, a town in the United States

Science and technology

Biology and medicine

• Emergency room, a medical facility specializing in acute, emergency care, usually found in a hospital or other primary care center
• Endoplasmic reticulum, a type of organelle in cell biology
• Equine exertional rhabdomyolysis, a syndrome that damages muscle tissue in horses
• Estrogen receptor, a type of protein molecule
• Extraction ratio, a pharmacokinetic property

Other uses in science and technology

• , a representation for relative static permittivity
• Electrorheological (ER) fluid, a type of chemical suspension
• Enantiomeric ratio, a concept in chemistry
• Entity–relationship model, a conceptual representation of data
• Erbium, chemical element with symbol Er
• Erdős–Rényi model, a model in graph theory
• Error Resilience, an audio coding method used in MPEG-4 Part 3

Other uses

• .er, country code top-level domain (ccTLD) for Eritrea
• Er., Hebrew abbreviation for 'Eruvin, the second tractate of Moed
• Earned run, a term in the game of baseball
• Emergency Response, team or processes related to emergency services
• English Reports of the English Courts from 1220 to 1866
• Entre Ríos, several uses

See also

• Err (disambiguation)
• Erro (disambiguation)
• Error (disambiguation)
• Ur (disambiguation)