D40

D40 may refer to:

• D40 Navara, a 2005 Nissan pickup truck
• HMS Searcher (D40), a 1942 British Royal Navy Attacker-class escort carrier
• LNER Class D40, a 1899 British type of 4-4-0 steam locomotive
• Nikon D40, a 2006 digital SLR range camera
• D40 road (Croatia), a state road

and also:

• the ICD-10 code for a neoplasm of uncertain or unknown behaviour of male genital organs

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