A gibbet is any instrument of public execution. Gibbeting is the use of a gallows-type structure from which the dead or dying bodies of criminals were hanged on public display to deter other existing or potential criminals. Occasionally, the gibbet was also used as a method of execution, with the criminal being left to die of exposure, thirst and/or starvation. The practice of placing a criminal on display within a gibbet is also called "hanging in chains".

A gallows is a frame or elevated beam, typically wooden, from which objects can be suspended or "weighed". Gallows were thus widely used to suspend public weighing scales for large and heavy objects such as sacks of grain or minerals, usually positioned in markets or toll gates. The term was also used for a projecting framework from which a ship's anchor might be raised so it is no longer sitting on the seabed, riverbed or dock; "weighing [the] anchor" meant raising it using this apparatus while avoiding striking the ship's hull.