// Workers AI · dad joke modeWhy was D9 sad? Because it was a digit-al downer.

D9, D09, D.IX, D IX, D.9 or D-9 may refer to:

Transport and vehicles

Albatros D.IX, a 1918 German prototype single-seat fighter
Bavarian D IX, an 1888 German steam locomotive model
Bottineau Municipal Airport, FAA LID D09, a public airport in North Dakota, United States
BHP Port Kembla D9 class, a class of Australian diesel-electric locomotives
Caterpillar D9, a 1954 large bulldozer/track-type tractor
- IDF Caterpillar D9, an armored bulldozer
Denza D9, a minivan by BYD Auto
Donavia, IATA code D9, a former subsidiary of Aeroflot
D9 road (Croatia), a state road in Croatia
HMS D9, a 1912 British E class submarine
HMS Imperial (D09), a 1936 British Royal Navy I-class destroyer
HMS Trumpeter (D09), a 1942 British Royal Navy escort aircraft carrier
Jodel D9, a 1948 French single-seat ultralight monoplane
LNER Class D9, a class of British steam locomotives

Delta-9-THC, the delta-9 isomer of THC
ATC code D09, Medicated dressings, a classification for medical products
D-9 (video), a video format also known as Digital-S
D9-brane, a class of objects in string theory
D-IX, a Nazi performance-enhancing drug
District 9, a 2009 film
The "Divine Nine" (D9), nickname for the National Pan-Hellenic Council, an African American fraternities and sororities council
Dublin 9, a Dublin, Ireland postal district
Digital 9, a collaborative network of the world's leading digital governments
Diensteinheit IX - a military unit of the East German police the Volkspolizei