The D-subminiature or D-sub is a common type of electrical connector.
D50 state road, located mainly in Lika region of Croatia connecting cities and towns of Korenica, Gospić and Karlobag, to the state road network of Croatia, and most notably to D1 and D8 state roads and the A1 motorway Gospić interchange (via D534 state road).
Manitowish Waters Airport is a town owned public use airport located one mile (1.6 km) south of the central business district of Manitowish Waters, a town in Vilas County, Wisconsin, United States.
The New Standard D-25 was a 5-seat agricultural and joy-riding aircraft produced in the USA from 1928.
The RD-861 is a Soviet liquid propellant rocket engine burning UDMH and nitrogen tetroxide in a gas generator combustion cycle.
The Soloviev D-25V is a Soviet gas-turbine turboshaft engine for use in large helicopters.
122 mm corps gun M1931/37 (A-19) (122-мм корпусная пушка обр.) was a Soviet field gun developed in late 1930s by combining the barrel of the 122 mm gun M1931 (A-19) and the carriage of the 152 mm howitzer-gun M1937 (ML-20).