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.
Storm surge is a large volume of ocean water that is driven ashore by a land falling hurricane or tropical storm. Storm surge is a rapid rise in sea level, accompanied by large battering waves. The surge is caused by strong onshore winds forcing the ocean level to rise up and flow inland.