Virtanäppäin

Virtanäppäin, also known as the power button, is a common interface element found on electronic devices that controls the flow of power. Typically, it is a physical button or a touch-sensitive area that initiates or terminates the device's operation. Pressing the virtanäppäin can wake a device from a sleep state, turn it on, or shut it down. The exact behavior often depends on the context, such as whether the device is already powered on or in a low-power mode.

On many devices, a short press of the virtanäppäin might toggle the screen on or off, while a longer press could bring up a menu for shutting down, restarting, or activating airplane mode. The visual representation of a virtanäppäin is usually a circle with a vertical line inside it, symbolizing power on and off states. This universal icon helps users quickly identify and operate the device's power controls across different product types and brands. Its simplicity and effectiveness have made it an indispensable feature in modern electronics.