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Wiktionary
triple-click

n. (context computing English) The action of pushing the button on a mouse three times in quick succession in order to perform a different task that would be performed from a single-click or double-click. vb. (context computing English) To push the button on a mouse three times in quick succession in order to perform different task that would be performed from a single-click or double-click.

Wikipedia
Triple-click

A triple-click is the action of clicking a computer mouse button three times quickly without moving the mouse. Along with clicking and double-clicking, triple-clicking allows three different actions to be associated with the same mouse button. Criticism of the double-click mechanism is even more valid for triple-clicks. However, few applications assign critical actions to a triple click.