ER
ER or Er may refer to: == Arts, entertainment and media == ER (TV series), a 1994–2009 American medical drama series E/R, a 1984–1985 American TV sitcom Er, a character in Plato's Myth of Er Er, a 2005 album by Nils Petter Molvær "ER" (song), a 2012 song by Kanjani Eight "ER", a song by Royce da 5'9" featuring Kid Vishis from the 2011 album Success Is Certain Chico Enterprise-Record, the daily newspaper of Chico, California, US == Businesses and organizations == Astar Air Cargo, an American cargo airline, IATA designator ER Eastern Railway zone, in India Estonian Reform Party == Language == Er (Cyrillic) (Р р), a letter of the Cyrillic alphabet Er (cuneiform), a sign in cuneiform writing "er", a filler word in English Suffix -er in English: added to adjectives or adverbs to form a comparative (e.g., fast to faster) added to a noun to indicate resident of, as in New Yorker added to a verb to make it an agent noun (e.g., cut to cutter) Oxford "-er", used to form words like rugger and footer R-colored vowel, usually written as "er" in English Erhua, adds er sound to syllables in spoken Mandarin Chinese == People == Er (biblical person), the eldest son of Judah in the book of Genesis Nie Er (1912–1935), Chinese composer Elliot Rodger (1991–2014), British-American mass murderer Gültigin Er (born 1997), Turkish triathlete ER, a royal cypher representing a monarch whose name begins with E == Science and technology == === Biology and medicine === Emergency room, or emergency department, a medical facility Endoplasmic reticulum, a type of organelle in cell biology Er blood group system Equine exertional rhabdomyolysis, in horses Estrogen receptor, a type of protein molecule Extraction ratio, in renal physiology === Chemistry and physics === ε r {\displaystyle \varepsilon _{r}} , relative permittivity Electrorheological fluid, suspensions of non-conducting but electrically active particles Enantiomeric ratio, in chemistry Erbium, symbol Er, a chemical element Einstein-Rosen bridge, or ER bridge, relativistic wormholes === Computing === .er, country code top-level domain for Eritrea Entity–relationship model, a conceptual representation of data Error Resilience, an audio coding method used in MPEG-4 Part 3 === Engineering === Engine room, a compartment of a ship where the machinery for marine propulsion is located.