All articles A–Z
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Echion Linea
Echion Linea is a 1026 km linea on Jupiter's moon Europa, centered at -11.6°, 185.2°, IAU-approved in 1985 and named for the Spartoi survivor and founder of Thebes in Greek myth.
Echis
Echis, saw-scaled or carpet vipers, a genus of small African-Middle Eastern-South Asian vipers; 12-13 species in four complexes; SVMP-rich procoagulant venom causing consumption coagulopathy; deadliest snake genus by kill count; antivenom is region-specific.
Echis carinatus
Echis carinatus, the saw-scaled viper, is a small, highly venomous viper from North Africa to South Asia, among the leading causes of snakebite death in India.
Echium
Echium, borage family genus of 68 species native to Macaronesia, Europe, and North Africa; known for Canary Island adaptive radiation, insular woodiness, giant rosette trees like E. wildpretii, and pyrrolizidine alkaloid defenses.
Echium vulgare
Echium vulgare, viper's bugloss or blueweed, is a Eurasian Boraginaceae biennial with violet-blue flowers, pyrrolizidine alkaloid toxicity to livestock, and noxious-weed status in parts of North America and Australia.
Echiura
Echiura, spoon worms or innkeeper worms, are unsegmented marine annelids with a long extendable proboscis; about 198 accepted species, burrowing deposit and filter feeders from intertidal to 10,000 m depths.
Echizen washi
Echizen washi (越前和紙) is traditional Japanese paper made in Echizen City, Fukui Prefecture, ranked among Japan's three great washi traditions with about 1,500 years of history.
ECHL
The ECHL (formerly East Coast Hockey League) is the AA-level minor professional ice hockey league below the AHL; founded 1988-89 with five teams, it has 30 teams in 2025-26 and 776 alumni who reached the NHL.
Echo
An echo is a repetition of a sound reflected from a surface, arriving at least about 50 ms after the original to be heard as a separate event.
Echo (EP)
Echo (EP) is the second EP by Jin, a South Korean singer and member of BTS. Released May 16, 2025, it features the lead single "Don't Say You Love Me."
Echo (Marvel Comics)
Echo (Maya Lopez) is a Marvel Comics superhero created by David Mack and Joe Quesada in Daredevil #9 (1999): a Deaf Cheyenne warrior with photographic reflexes, the first Ronin, Phoenix Force host, and MCU character played by Alaqua Cox.
Echo (miniseries)
Echo (2024) is a five-episode Marvel Studios miniseries on Disney+ and Hulu, a Hawkeye spin-off starring Alaqua Cox as deaf Choctaw hero Maya Lopez pursued by Kingpin; the first Marvel Spotlight and TV-MA Marvel series.
Echo (mythology)
Echo (Greek Ἠχώ, Ekho) is the Oread nymph of Mount Kithairon punished by Hera to repeat only others' last words; rejected by Narcissus, she wasted away leaving only her voice, with an alternative Pan tradition from Longus.
Echo (The Americans)
"Echo" is the thirteenth episode and season finale of the second season of the American television drama The Americans, written by Joel Fields and Joe Weisberg and directed by Daniel Sackheim.
Echo & the Bunnymen
Echo & the Bunnymen, Liverpool post-punk band formed 1978 by Ian McCulloch and Will Sergeant; albums Crocodiles and Ocean Rain, hit The Killing Moon; reformed 1997, new album Apples for Isaac 2026.
Echo 3
Echo 3 is a 2022 Apple TV+ action thriller, Mark Boal's adaptation of the Israeli series When Heroes Fly, starring Michiel Huisman, Luke Evans, and Jessica Ann Collins in a Colombia-set kidnapping rescue story; 10 episodes, Metascore 67.
Echo and Narcissus
Echo and Narcissus: intertwined Greek myth told fully in Ovid's Metamorphoses 3.339–510, where the self-loving youth wastes away at a spring and the Hera-cursed nymph dwindles to a voice; source of the psychological term narcissism and a vast art and literary reception.
Echo canceller
An echo canceller is a signal processing device that estimates echo in a communication channel with an adaptive filter and subtracts it in real time, without interrupting transmission.
Echo Chamber (jailbreak technique)
Echo Chamber is a multi-turn jailbreak technique against large language models, disclosed in June 2025 by the AI security company NeuralTrust after routine adversarial testing.
Echo chamber (media)
Echo chamber (media): a media environment reinforcing beliefs via like-minded peers and sources; related to Pariser's filter bubble. Evidence is split: computational homophily studies support it, surveys and Facebook experiments question its polarizing effects.
Echo Global Logistics
Echo Global Logistics is a Chicago-based third-party logistics company founded in 2005 by Brad Keywell and Eric Lefkofsky, connecting shippers with a network of more than 50,000 carriers.
Echo in the Canyon
Echo in the Canyon (2018) is Andrew Slater's documentary, hosted by Jakob Dylan, on the 1965-1967 Laurel Canyon scene and the California Sound of the Byrds, Beach Boys, Buffalo Springfield, and the Mamas and the Papas, inspired by a 2015 Orpheum tribute concert.
Echo Kellum
Echo Kellum, American actor and comedian born 1982 in Chicago, trained at Groundlings/UCB, known for Curtis Holt/Mr. Terrific on Arrow, roles in Ben & Kate and Sean Saves the World, and lead Noah on NBC's Grand Crew.
Echo Mensa
Echo Mensa is a 205-km-wide flat-topped plateau (mensa) in the far south of Jupiter's moon Io, IAU-named in 1985 for the Greek Echo, mother of Iynx, with a scarp about 1 km high.
Echo Music Prize
Echo Music Prize (ECHO, Deutscher Musikpreis): German music award of the Deutsche Phono-Akademie/BVMI, 1992–2018, in pop, classical, and jazz; pop winners chosen by chart sales, ended after the 2018 Kollegah and Farid Bang antisemitism scandal.
Echo of a Scream
Echo of a Scream (Eco de un grito) is a 1937 painting by Mexican muralist David Alfaro Siqueiros, held at the Museum of Modern Art in New York.
Echo sounder
An echo sounder is an active sonar instrument that measures water depth by timing an acoustic pulse's return from the seafloor, replacing the lead line in the early twentieth century.
Echo sounding
Echo sounding, also called depth sounding, measures water depth by timing a sound pulse's return from the seabed; it replaced the lead line in the early twentieth century.
Echo state network
An echo state network (ESN) is a recurrent neural network architecture introduced by Herbert Jaeger in 2001, in which only the readout connections are trained.
Echo suppressor
An echo suppressor is a voice-operated switching device on long-distance telephone circuits that blocks the return path so speakers cannot hear their own echo, developed by Bell System in 1925.