Fn

Short for Function, the Fn key is a keyboard key found on laptop computers that allows you to perform special functions on the laptop such as turning up the brightness or contrast, switching video modes, and/or printing the screen.

Above is an example of the Fn keyboard key found on a laptop. As can be seen in this example the laptop has a color coded Fn key and matching colors on the keys with symbols symbols representing what the keys do. In this example pressing and holding down the Fn key and pressing the up or down arrows would increase or decrease the brightness. Other laptops may have the Fn key with a square around it and similar symbols on other keys such as the F7 and F8 key.