493bbc30__Touch_Gesture_Reference_Guide__Platform_Description
[Platform] iPhone OS [Platform Gesture] Tap [Core Gesture] Tap [Platform Description] 
A user gesture used to press or select a control or link (analogous to a singleclick in a desktop application). To tap, users make a quick up-and-down motion with a finger, lightly striking the screen.
LukeW | Touch Gesture Reference Guide
Platform Description