Three-finger salute

The "three-finger salute" is a colloquial term for performing a restart via the use of the keyboard shortcut which would be the equivalent of triggering the reset switch ("software reset switch").

Usage
On past Macintosh models, pressing command-shift-power button simultaneously would cause it to restart immediately, losing all unsaved changes in opened applications and documents. These keyboard shortcuts have since changed.

Chrome OS has a three-finger combination, which is esc + 🔄 + power button.

Windows has a three-finger combination, the classic "control-alt-delete", though it no longer restarts a PC. As of Windows 10, it invokes an interactive logon which can be used to launch the Task Manager.