A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Surge definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. See more.
The definition of wave is to move back and forth in a swinging motion, or to style your hair in a series of curves. When you move your hand back and forth in greeting, this is an example of a time when you wave.