in a pen-based system, to tap a pen twice in succession, used in a way equivalent to a double-click to select a range or activate an icon.

An example of a fault in which the mallet makes more than one audible sound when it strikes the striker’s ball.

Hitting the same key in rapid succession. See also 'Triple Tap'. Most commonly used in video games.

In reference to gaming, when a key is pressed twice in rapid succession.

 A user gesture (for tablets) used to zoom in or out of content - consists of two quick taps.  

a subtle double impression where additional friction ridges will coincide or be close to running in the same direction as the existing ridge flow.