Batons
An expandable baton (also referred to variously as a collapsible baton, telescopic (or telescoping) baton, tactical baton, spring cosh, asp, Extendable, or extendo. An expandable baton is opened by being swung in a forceful manner while collapsed, using inertia to extend and lock the segments by friction.
In theory, the mere display of extending the baton may in some instances be psychologically intimidating to an aggressive suspect (due to both the sight and sound of the action, with a similar intimidation technique as used in pump-action shotguns, and may thus deescalate the situation and preclude the necessity of any physical force being used at all.
