GONE FIRST' The term 'GONE FIRST' can be solved by the three letter word LED. LED stands for Light Emitting Diode, which is a semiconductor device that emits light when an electric current passes through it. LEDs are used in many applications such as indicator lights, automotive lighting, and even in some televisions. They are also used in many everyday items such as flashlights, remote controls, and cell phones. LEDs are becoming increasingly popular due to their energy efficiency and long life span.