A sickle, bagging hook, reaping-hook or grasshook is a single-handed agricultural tool designed with variously curved blades and typically used for harvesting or reaping grain crops, or cutting succulent forage chiefly for feeding livestock. Falx was a synonym but was later used to mean any of a number of tools that had a curved blade that was sharp on the inside edge such as a scythe.
Nepalese sickle from Panchkhal
One of 12 roundels depicting the "Labours of the Months" (1450-1475)
A very early sickle, c. 7000 BC, flint and resin, Tahunian culture, Nahal Hemar cave, now in the Israel Museum.
Neolithic sickle
A tool is an object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools.
Carpentry tools recovered from the wreck of a 16th-century sailing ship, the Mary Rose. From the top, a mallet, brace, plane, handle of a T-auger, handle of a gimlet, possible handle of a hammer, and rule.
Prehistoric stone tools over 10,000 years old, found in Les Combarelles cave, France
Bicycle multi-tool
A Bonobo at the San Diego Zoo "fishing" for termites