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Delay/disruption tolerant networking
Delay/disruption tolerant networking (DTN) is a suite of standard protocols that delivers data across networks with disconnections and long delays, using store-and-forward bundles; NASA operates it in space, formalized in RFC 4838 in 2007.
Delayed coking
Delayed coking is a semi-batch thermal cracking process that converts vacuum residue into gases, naphtha, gas oils, and petroleum coke, accounting for 88% of world coking capacity.
Delayed hydride cracking
Delayed hydride cracking is a time-dependent crack growth mechanism in zirconium alloys, in which hydrogen diffuses to a stressed crack tip, precipitates as brittle hydride, and fractures in repeated steps.
Delegated proof of stake
Delegated proof of stake (DPoS) is a blockchain consensus method in which token holders vote for a small set of delegates who validate transactions and produce blocks, used by EOSIO and TRON.
Delek Logistics Partners
Delek Logistics Partners is an American midstream energy master limited partnership formed in 2012, operating crude oil, natural gas, and water pipelines primarily around the Permian Basin.
Delek US
Delek US is an American diversified downstream energy company based in Brentwood, Tennessee, operating four refineries in Texas, Arkansas, and Louisiana with a combined capacity of 302,000 barrels per day.
Delfin LNG
Delfin LNG is a US deepwater port project for liquefying and exporting natural gas in the Gulf of Mexico off Louisiana, licensed in March 2025.
DelFly
DelFly is a family of dragonfly-like flapping-wing micro air vehicles developed at Delft University of Technology since 2005, ranging from 21 grams down to a record 3.07-gram camera-carrying micro version.
Delhi Cantonment
Delhi Cantonment, popularly Delhi Cantt, is a combined military and civilian cantonment in southwest Delhi, India, established in 1914 and run by the Delhi Cantonment Board.
Delhi Junction railway station (दिल्ली जंक्शन रेलवे स्टेशन)
Delhi Junction railway station, popularly known as Old Delhi railway station, is the oldest railway station in Delhi, opened in 1903 with 16 platforms today.
Delhi Metro (दिल्ली मेट्रो)
Delhi Metro (दिल्ली मेट्रो) is a rapid transit system serving Delhi and adjoining National Capital Region cities, operated by DMRC since its first corridor opened in 2002.
Delhi Metro Rail Corporation
Delhi Metro Rail Corporation Limited (DMRC) is a joint venture of the Indian and Delhi governments, registered in 1995, that builds and operates the Delhi Metro and runs the Aqua Line and Rapid Metro Gurugram.
Delhi Transco
Delhi Transco Limited, also known as DTL, is the Delhi government's state transmission utility, formed on 1 July 2002 from the unbundled Delhi Vidyut Board, operating Delhi's extra-high-voltage grid.
Delhi-class destroyer
The Delhi-class destroyer (Project 15) is a class of three guided-missile destroyers of the Indian Navy, the first major warship class designed and built in India after independence.
Delhi–Amritsar–Katra Expressway
The Delhi–Amritsar–Katra Expressway, also known as the Delhi–Katra Expressway, is a 670 km greenfield expressway in India linking Delhi with Amritsar and the pilgrimage town of Katra.
Delhi–Meerut Expressway
The Delhi–Meerut Expressway is an 82 km access-controlled expressway connecting Sarai Kale Khan in Delhi with Meerut in Uttar Pradesh, cutting travel time to about 45 minutes.
Delhi–Meerut Regional Rapid Transit System
The Delhi–Meerut Regional Rapid Transit System, or Delhi–Meerut RRTS, is India's first semi-high-speed regional rail corridor, operated as Namo Bharat and fully operational since February 2026.
Delhi–Mumbai Expressway (दिल्ली–मुंबई एक्सप्रेसवे)
The Delhi–Mumbai Expressway (दिल्ली–मुंबई एक्सप्रेसवे) is an under-construction 8-lane access-controlled expressway in India connecting Delhi with Mumbai, India's longest at about 1,320 km, built to cut the journey from 24 hours to about 12.
Delia Milliron
Delia Milliron is a nanomaterials chemist who is chair of chemical engineering at the University of Michigan, known for electrochromic smart windows and the 2023 MRS Medal.
Delicious (website)
Delicious, originally styled del.icio.us, was a social bookmarking website launched in 2003 by Joshua Schachter and acquired by Yahoo in December 2005, reaching 5.3 million users.
Delilah I Solar Energy Center
Delilah I Solar Energy Center is a 300-megawatt utility-scale solar power plant in Northeast Texas that sells its output to Honda and Tesla under 15-year contracts.
Delimara FSRU
The Delimara FSRU is the floating LNG import facility at Delimara, Marsaxlokk, Malta, which since 2017 has supplied natural gas to the Delimara power stations, pairing a moored LNG storage vessel with an onshore regasification plant.
Delimiter-separated values
Delimiter-separated values (DSV), also called a delimited text file, is a family of plain-text formats for storing tabular data, best known as CSV, which uses commas, and TSV, which uses tabs.
Delineator
A delineator is a retroreflective device mounted on posts along the side of a road, in a series, to show drivers the roadway alignment, staying visible in rain or snow.
Delivery (commerce)
Delivery in commerce is the transport of purchased goods from a seller to the buyer, whose final leg, the last mile, is the most labor-intensive and costly stage.
Delivery drone
A delivery drone is an unmanned aircraft that carries packages, food, or medical supplies directly to customers, typically as the final leg of a logistics network, or last-mile delivery.
Delivery Hero
Delivery Hero is a German food delivery and quick commerce company headquartered in Berlin. Founded in 2011, it operates in about 70 countries across four continents.
Dell
Dell is an American technology company founded by Michael Dell in 1984, known for selling PCs directly to customers; its fiscal 2026 revenue was $113.5 billion.
Dell DRAC
Dell DRAC (Dell Remote Access Controller), known as iDRAC since integrated generations, is Dell's embedded out-of-band management controller for PowerEdge servers, enabling remote console and power control even when the server is off.
Dell EMC
Dell EMC was the enterprise business sub-brand created in 2016 after Dell's $67 billion acquisition of EMC Corporation, covering storage, servers, and data infrastructure; the name was retired in 2020.