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Daytime running lamp
A daytime running lamp (DRL), also called daytime running lights, is a vehicle lamp that switches on automatically to make cars more visible in daylight.
Dayton H. Clewell
Dayton H. Clewell (1912–1992) was an American physicist who led petroleum research at Magnolia Petroleum and Mobil Oil, retiring as Mobil's senior vice-president for research and engineering.
Dayton International Airport
Dayton International Airport, officially James M. Cox Dayton International Airport, is a publicly owned commercial airport in Vandalia, Ohio, nine miles north of Dayton, owned by the City of Dayton.
Daytona International Speedway
Daytona International Speedway, known as the World Center of Racing, is a motorsports complex in Daytona Beach, Florida, opened in 1959, hosting the Daytona 500 and Rolex 24.
Daytona NGL Pipeline
The Daytona NGL Pipeline is a 400,000-barrel-per-day pipeline owned by the Grand Prix joint venture and operated by Targa Resources, carrying Y-grade NGLs from the Permian Basin to Mont Belvieu, Texas.
Dazzle camouflage
Dazzle camouflage, also known as dazzle painting or razzle dazzle, is a ship camouflage using bold, high-contrast geometric patterns to mislead submarine observers about a ship's speed, distance, and direction.
DB Class 103
The DB Class 103 is a six-axle German electric locomotive built from 1970 to 1974 that hauled West Germany's fastest express trains at 200 km/h.
DB Class 218
The DB Class 218 (Baureihe 218) is a German four-axle diesel-hydraulic locomotive built from 1968, with more than 400 built in the 1970s and still the standard diesel on Deutsche Bahn's non-electrified routes.
DB Class 628
The DB Class 628 (Baureihe 628) is a two-car diesel multiple unit that became the backbone of regional rail traffic on non-electrified lines in Germany from the mid-1980s.
DB Class V 160
The DB Class V 160, renumbered Class 216 in 1968, was a German diesel-hydraulic mainline locomotive of the Deutsche Bundesbahn; 224 were built, the last withdrawn in 2004.
DB Schenker
DB Schenker was the transport and logistics division of German state railway Deutsche Bahn, with about 76,600 employees in more than 130 countries, sold to DSV in 2025.
DB V 160 family
The DB V 160 family is a group of single-engine diesel-hydraulic mainline locomotives developed for the Deutsche Bundesbahn from 1960, comprising the V 160 and its derivatives, classes 210 to 219.
DBeaver
DBeaver is a free, Java-based database tool and SQL client for developers, administrators, and analysts, supporting any database with a JDBC or ODBC driver; a free Community edition and paid PRO editions are available.
DBoW2
DBoW2 is an open source C++ library for converting images into bag-of-words representations, used for fast place recognition and loop-closure detection in visual SLAM systems.
DBpedia
DBpedia is a knowledge graph that extracts structured information from Wikipedia as RDF data. Launched in 2007, it serves as a hub for linked open data on the Web.
Dbrand
Dbrand is a Canadian accessories company based in Toronto, founded in 2011 and led by CEO Adam Ijaz, known for vinyl skins, phone cases, and its 2023 Casetify copyright lawsuit.
DBRX
DBRX is an open-weight mixture-of-experts large language model released by Databricks on March 27, 2024, with 132 billion total parameters and 36 billion active per input.
DBSCAN
DBSCAN (Density-Based Spatial Clustering of Applications with Noise) is a density-based clustering algorithm that finds clusters of arbitrary shape and labels points in low-density regions as noise.
DbSNP
DbSNP, the Database of Single Nucleotide Polymorphisms, is a public archive maintained by NCBI since 1999 that catalogs SNPs and other short genetic variations, each with a stable rs identifier.
dbt (software)
dbt, originally the data build tool, is a SQL transformation framework with an Apache 2.0 open-source core (dbt OSS, formerly dbt Core), launched in 2016 by Fishtown Analytics (now dbt Labs, merged with Fivetran in 2026) that builds DAGs of warehouse models, tests, and docs; its Rust-based v2 ships as dbt and the Apache 2.0 dbt OSS.
dbt Labs
dbt Labs, a Philadelphia company founded in 2016 as Fishtown Analytics, develops dbt, a SQL transformation framework with an Apache 2.0 open-source core (dbt OSS, formerly dbt Core), and the dbt platform (formerly dbt Cloud); valued at $4.2B in 2022 with $100M ARR, it merged with Fivetran in June 2026.
dbx (noise reduction)
dbx is a companding noise-reduction system for analog audio recording, developed by David E. Blackmer in the early 1970s and competing with Dolby in professional and consumer markets.
DC circuit breaker
A DC circuit breaker is a switching device that interrupts direct current in DC power systems; unlike AC breakers, it must create a current zero artificially and dissipate stored energy.
DC connector
A DC connector, also called a DC plug, is an electrical connector for direct current, from power adapters to 1,500 V photovoltaic strings and EV charging.
DC disconnect switch
A DC disconnect switch, also called a DC isolator or PV disconnect, is a manually operated switch installed between a PV array and inverter for safe isolation.
DC electric cloak
A DC electric cloak is a device that hides an object from steady electric fields by guiding current around it, first experimentally demonstrated in 2012 using a resistor network.
DC load flow
The DC load flow, or DC power flow, is a linearized model of an AC transmission network that computes active power flows from bus voltage angles.
DC motor
A DC motor, or direct-current motor, is a rotating electric machine that converts direct-current electricity into torque, dating commercially from Antonio Pacinotti's 1864 ring armature.
DC Streetcar
The DC Streetcar, also called the H Street Trolley, was a fare-free streetcar in Washington, D.C. running 2.4 miles along H Street and Benning Road from 2016 until 2026.
DC Universe (streaming service)
DC Universe was an American subscription streaming service from DC Entertainment and Warner Bros., launched in 2018 and rebranded in 2021 as the comics-only DC Universe Infinite.