A dumbbell is a piece of equipment used in weight training. Dumbbell may also refer to: Dumbbells (film), a 2014 film The Dumbbell Nebula is a planetary nebula (M27), which is shaped like a dumbbell Physics: A p atomic orbital has the approximate shape of a pair of lobes on opposite sides of the nucleus, or a somewhat dumbbell shape The name "dumbbell tenement" was also used for the apartment buildings in the Lower East Side of New York City in the late 19th century A "dumbbell interchange" is a type of road interchange Dumbbell interstitials, a type of crystal defect DUMBBELLS, mnemonic for cholinergic overdose, also known as SLUDGE syndrome