Technology and the built world

Ellipsoid method

The ellipsoid method is an iterative algorithm for convex optimization that shrinks enclosing ellipsoids, used by Khachiyan in 1979 to prove linear programming solvable in polynomial time.

Elliptic Curve Digital Signature Algorithm

The Elliptic Curve Digital Signature Algorithm (ECDSA) is a public-key signature algorithm over elliptic curves, specified by NIST in FIPS 186-5 and used in TLS and Bitcoin.

Elliptic orbit

An elliptic orbit, also called an elliptical orbit, is a closed, gravitationally bound path in which one body follows an ellipse around another, as the planets do around the Sun.

Elliptic-curve cryptography (ECC) is a form of public-key cryptography, proposed by Neal Koblitz and Victor Miller in 1985, whose security rests on the elliptic curve discrete logarithm problem and achieves RSA-comparable security with far smaller keys.

Sep 29, 2026

Elliptic-curve Diffie–Hellman

Elliptic-curve Diffie–Hellman (ECDH) is a key agreement protocol in which two parties derive a shared secret key over an insecure channel by exchanging points on an elliptic curve.

Ellis Bridge

Ellis Bridge, officially renamed Swami Vivekanand Bridge, is a heritage steel truss bridge across the Sabarmati River in Ahmedabad, Gujarat, built in 1892 as a symbol of the city.

Ellison Onizuka

Ellison Shoji Onizuka was an American NASA astronaut and Air Force flight test engineer, the first Asian American in space, who died in the 1986 Challenger disaster.

Ellwood Zimmerman House

The Ellwood Zimmerman House was a 1950 mid-century modern residence in Brentwood, Los Angeles, designed by Craig Ellwood for Martin and Eva Zimmerman and demolished in 2024.

Elm (programming language)

Elm, also known as Elmlang, is a purely functional, statically typed programming language for building web browser user interfaces, created by Evan Czaplicki in his 2012 Harvard thesis.

Elm Road power station

Elm Road Generating Station is a two-unit coal-fired power plant at We Energies' Oak Creek site on Lake Michigan, Wisconsin, operating since 2010 with about 1,268 MW capacity.

ELM327

The ELM327 is an interpreter chip by Canada's Elm Electronics, produced since 2005, that turns a vehicle's OBD-II data into plain text commands over a serial link.

Sep 29, 2026

Elman neural network

The Elman neural network, also called a simple recurrent network, is a recurrent network that copies its hidden layer's previous activations into a context layer, enabling sequence prediction.

Elmer Ambrose Sperry

Elmer Ambrose Sperry (1860–1930) was an American inventor and engineer who founded the Sperry Gyroscope Company and pioneered the gyrocompass, ship stabilizers, and automatic pilots.

Elmer G. Gilbert

Elmer G. Gilbert (Elmer Grant Gilbert, 1930–2019) was an American control theorist and aerospace engineer at the University of Michigan, known for the Gilbert realization and the reference governor.

Elmer L. Gaden

Elmer L. Gaden (1923–2012) was an American biochemical engineer called the father of biochemical engineering, whose oxygen-transfer research enabled large-scale antibiotic production and who founded Biotechnology and Bioengineering.

Elmina Castle

Elmina Castle, also known as São Jorge da Mina, is a Portuguese-built fortress in Elmina, Ghana, from 1482, now the oldest European structure in sub-Saharan Africa.

Elmira Corning Regional Airport

Elmira Corning Regional Airport (ELM/KELM), also called Elmira/Corning Regional, is a Chemung County-owned non-hub commercial airport in Horseheads, New York, with three runways, Delta and Allegiant service to five US destinations, and a 2019 record of 157,338 enplanements.

Elmworth Oil and Gas Field

Elmworth Oil and Gas Field is a giant natural gas field in the Deep Basin of west-central Alberta, discovered in 1976, holding an estimated 17 trillion cubic feet of gas.

Elnusa

Elnusa (PT Elnusa Tbk) is an Indonesian integrated energy services company founded in 1969 as a Pertamina support contractor and controlled by Pertamina Hulu Energi, which holds 51.10%.

Elo Touch Solutions

Elo Touch Solutions is an American manufacturer of touchscreen monitors, interactive displays, and point-of-sale systems, founded as Elographics in 1971 and acquired by Zebra Technologies in 2025.

Elobau

Elobau is a German manufacturer of contactless sensor technology and operator controls for mobile machinery and industrial applications, founded in 1972 and headquartered in Leutkirch im Allgäu.

Elon Musk

Elon Reeve Musk is an American business executive who has led Tesla since 2008 and founded SpaceX in 2002, later buying Twitter for $44 billion in 2022.

Elon Musk's Tesla Roadster

Elon Musk's Tesla Roadster, also called the Space Roadster, is a sports car carrying mannequin Starman that SpaceX launched on the first Falcon Heavy flight in 2018 into an orbit around the Sun.

Elopak

Elopak is a Norwegian supplier of carton packaging and filling machines for liquid food, founded in 1957 and best known for the Pure-Pak gable-top carton sold worldwide.

ELoran

ELoran, also known as Enhanced LORAN, is a terrestrial navigation and timing system at 100 kHz and a modernized successor to Loran-C that keeps working when GPS is jammed.

ELROB

ELROB, the European Land Robot Trial, is a European field trial for unmanned ground systems held since 2006 by Fraunhofer FKIE for the German Armed Forces.

Elsa Olivetti

Elsa A. Olivetti is a materials scientist and professor at MIT who models the cost and environmental impact of materials, including metals recycling and lithium-ion battery supply chains.

Elsa Reichmanis

Elsa Reichmanis is an Australian-born chemical engineer who developed the chemically amplified photoresists that made deep-ultraviolet lithography workable in silicon chip manufacturing, winning the 2001 Perkin Medal.

Elsie de Wolfe

Elsie de Wolfe (1865–1950), later Lady Mendl, was an American interior decorator and the first professional decorator in the United States, known for light colors and the aesthetic "light, air and comfort."