käännynnäppäimen

Käännynnäppäimen, meaning "switch key" in Finnish, refers to a type of key on a keyboard or other input device that performs a different function than its printed label suggests. This is often achieved through a modifier key, such as "Fn" (Function), which, when pressed in conjunction with another key, alters the key's output. For example, on many laptop keyboards, pressing Fn and an arrow key might control media playback or screen brightness, functions typically assigned to dedicated keys on larger keyboards.

The concept of a käännynnäppäin allows for more functionality to be condensed into a smaller physical space, making it particularly useful for compact devices like laptops and mobile keyboards. The specific functions assigned to käännynnäppäimet vary greatly between manufacturers and models, and are often customizable through software. Users might need to consult their device's manual or accompanying software to understand and utilize all the available käännynnäppäin functions. The term highlights the idea of a key that "turns" or "switches" its behavior based on context.