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reaping hook
A sickle, particularly a small one with a short handle used for cutting grass or crops.
cant hook
A traditional logging tool consisting of a wooden lever handle with a movable metal hook at one end, used for handling and moving logs.
Hooke's atom
(physics) An artificial helium-like atom where the Coulombic electron-nucleus interaction potential is replaced by a harmonic potential.
hook turn
A turn made by a vehicle across all lanes of traffic, sometimes used to improve the flow of through traffic or to keep the middle of the road free for trams etc.
dog hook
A tool used to manipulate logs; a peavy.
hook shots
retroflex hook
(typography) A hamiform diacritic used to mark consonantal retroflexion.
mouth hook
either of a pair of hooked larval mouthparts that function as jaws in some Diptera